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2to3.html
58.11
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2019-03-27 12:19
__builtin__.html
10.81
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__future__.html
14.34
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__main__.html
7.34
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_winreg.html
63.12
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abc.html
25.22
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aepack.html
13.83
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aetools.html
16
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aetypes.html
20.53
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aifc.html
24.48
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al.html
18.23
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allos.html
34.47
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anydbm.html
17.7
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archiving.html
9.84
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argparse.html
257.44
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array.html
31.11
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ast.html
37.27
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asynchat.html
33.13
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asyncore.html
39.68
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atexit.html
18.02
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audioop.html
33.45
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autogil.html
8.53
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base64.html
21.35
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basehttpserver.html
36.56
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bastion.html
11.52
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bdb.html
40.42
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binascii.html
22.46
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binhex.html
11.04
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bisect.html
24.09
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bsddb.html
27.92
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bz2.html
28.37
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calendar.html
40.78
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carbon.html
50.78
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cd.html
29.33
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cgi.html
54.61
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cgihttpserver.html
13.7
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cgitb.html
11.98
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chunk.html
15.53
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cmath.html
27.7
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cmd.html
28.36
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code.html
26.33
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codecs.html
115.49
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codeop.html
15.53
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collections.html
144.19
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colorpicker.html
7.85
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colorsys.html
11.64
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commands.html
15.15
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compileall.html
18.18
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compiler.html
74.12
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configparser.html
66.16
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constants.html
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contextlib.html
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cookie.html
40.87
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cookielib.html
88.9
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copy.html
12.7
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copy_reg.html
14.35
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crypt.html
10.4
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crypto.html
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csv.html
74.66
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ctypes.html
258.37
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curses.ascii.html
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curses.html
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curses.panel.html
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custominterp.html
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datatypes.html
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datetime.html
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dbhash.html
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dbm.html
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debug.html
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decimal.html
217.1
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development.html
14.48
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difflib.html
89.82
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2019-03-27 12:19
dircache.html
12.01
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2019-03-27 12:19
dis.html
82.18
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distribution.html
7.5
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distutils.html
9.91
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dl.html
17.25
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doctest.html
181.53
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docxmlrpcserver.html
17.16
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2019-03-27 12:19
dumbdbm.html
15.18
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dummy_thread.html
9.83
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dummy_threading.html
8.72
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2019-03-27 12:19
easydialogs.html
32.35
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2019-03-27 12:19
email-examples.html
46.31
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2019-03-27 12:19
email.charset.html
28.73
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2019-03-27 12:19
email.encoders.html
12.55
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email.errors.html
17.53
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email.generator.html
22.6
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email.header.html
28.43
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email.html
54.42
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email.iterators.html
12.33
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email.message.html
68.54
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email.mime.html
30.91
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2019-03-27 12:19
email.parser.html
34.32
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2019-03-27 12:19
email.utils.html
26.44
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2019-03-27 12:19
ensurepip.html
17.9
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2019-03-27 12:19
errno.html
39.3
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2019-03-27 12:19
exceptions.html
62.2
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2019-03-27 12:19
fcntl.html
25.63
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filecmp.html
23.43
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2019-03-27 12:19
fileformats.html
9.43
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fileinput.html
26.44
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filesys.html
10.61
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fl.html
55.2
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2019-03-27 12:19
fm.html
12.7
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fnmatch.html
15.88
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2019-03-27 12:19
formatter.html
36.5
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fpectl.html
16.48
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fpformat.html
11.19
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2019-03-27 12:19
fractions.html
24.3
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framework.html
36.07
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frameworks.html
7.37
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ftplib.html
48.42
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functions.html
200.82
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functools.html
28.95
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future_builtins.html
14.14
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gc.html
27.76
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gdbm.html
17.39
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gensuitemodule.html
12.28
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getopt.html
24.69
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getpass.html
11.16
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gettext.html
82.98
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gl.html
23.77
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glob.html
14.09
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grp.html
11.05
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gzip.html
20.09
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hashlib.html
24.87
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2019-03-27 12:19
heapq.html
34.07
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hmac.html
14.04
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hotshot.html
19.67
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htmllib.html
27.03
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htmlparser.html
41.44
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httplib.html
69.27
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i18n.html
9.81
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ic.html
18.22
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idle.html
41.16
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imageop.html
15.72
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imaplib.html
57.14
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imgfile.html
12.43
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imghdr.html
11.95
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imp.html
36.72
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importlib.html
8.72
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imputil.html
32.78
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index.html
77.23
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inspect.html
55.49
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internet.html
25.53
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intro.html
9.13
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io.html
111.04
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ipc.html
16.21
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itertools.html
122.46
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jpeg.html
13.43
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json.html
71.95
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keyword.html
8.02
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language.html
11.41
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linecache.html
11.15
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locale.html
60.13
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logging.config.html
78.17
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logging.handlers.html
78.31
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logging.html
107.67
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mac.html
22.83
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macos.html
15.75
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macosa.html
13.75
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macostools.html
16.5
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macpath.html
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mailbox.html
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mailcap.html
13.8
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markup.html
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marshal.html
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math.html
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md5.html
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mhlib.html
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mimetools.html
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mimetypes.html
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mimewriter.html
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mimify.html
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miniaeframe.html
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misc.html
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mm.html
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mmap.html
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modulefinder.html
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modules.html
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msilib.html
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msvcrt.html
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multifile.html
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multiprocessing.html
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mutex.html
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netdata.html
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netrc.html
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new.html
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nis.html
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nntplib.html
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numbers.html
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numeric.html
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operator.html
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optparse.html
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os.html
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os.path.html
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ossaudiodev.html
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othergui.html
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parser.html
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pdb.html
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persistence.html
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pickle.html
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pickletools.html
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pipes.html
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pkgutil.html
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platform.html
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plistlib.html
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popen2.html
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poplib.html
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posix.html
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posixfile.html
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pprint.html
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profile.html
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pty.html
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pwd.html
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py_compile.html
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pyclbr.html
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pydoc.html
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pyexpat.html
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python.html
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queue.html
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quopri.html
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random.html
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re.html
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readline.html
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repr.html
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resource.html
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restricted.html
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rexec.html
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rfc822.html
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rlcompleter.html
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robotparser.html
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runpy.html
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sched.html
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scrolledtext.html
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select.html
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sets.html
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sgi.html
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sgmllib.html
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sha.html
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shelve.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>8.7. sets — Unordered collections of unique elements — Python 2.7.16 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.16 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="8.8. sched — Event scheduler" href="sched.html" /> <link rel="prev" title="8.6. array — Efficient arrays of numeric values" href="array.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/library/sets.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="sched.html" title="8.8. sched — Event scheduler" accesskey="N">next</a> |</li> <li class="right" > <a href="array.html" title="8.6. array — Efficient arrays of numeric values" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="datatypes.html" accesskey="U">8. Data Types</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-sets"> <span id="sets-unordered-collections-of-unique-elements"></span><h1>8.7. <a class="reference internal" href="#module-sets" title="sets: Implementation of sets of unique elements. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sets</span></code></a> — Unordered collections of unique elements<a class="headerlink" href="#module-sets" title="Permalink to this headline">¶</a></h1> <div class="versionadded"> <p><span class="versionmodified">New in version 2.3.</span></p> </div> <div class="deprecated"> <p><span class="versionmodified">Deprecated since version 2.6: </span>The built-in <a class="reference internal" href="stdtypes.html#set" title="set"><code class="xref py py-class docutils literal notranslate"><span class="pre">set</span></code></a>/<a class="reference internal" href="stdtypes.html#frozenset" title="frozenset"><code class="xref py py-class docutils literal notranslate"><span class="pre">frozenset</span></code></a> types replace this module.</p> </div> <p>The <a class="reference internal" href="#module-sets" title="sets: Implementation of sets of unique elements. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sets</span></code></a> module provides classes for constructing and manipulating unordered collections of unique elements. Common uses include membership testing, removing duplicates from a sequence, and computing standard math operations on sets such as intersection, union, difference, and symmetric difference.</p> <p>Like other collections, sets support <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">in</span> <span class="pre">set</span></code>, <code class="docutils literal notranslate"><span class="pre">len(set)</span></code>, and <code class="docutils literal notranslate"><span class="pre">for</span> <span class="pre">x</span> <span class="pre">in</span> <span class="pre">set</span></code>. Being an unordered collection, sets do not record element position or order of insertion. Accordingly, sets do not support indexing, slicing, or other sequence-like behavior.</p> <p>Most set applications use the <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> class which provides every set method except for <a class="reference internal" href="../reference/datamodel.html#object.__hash__" title="object.__hash__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__hash__()</span></code></a>. For advanced applications requiring a hash method, the <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> class adds a <a class="reference internal" href="../reference/datamodel.html#object.__hash__" title="object.__hash__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__hash__()</span></code></a> method but omits methods which alter the contents of the set. Both <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> and <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> derive from <code class="xref py py-class docutils literal notranslate"><span class="pre">BaseSet</span></code>, an abstract class useful for determining whether something is a set: <code class="docutils literal notranslate"><span class="pre">isinstance(obj,</span> <span class="pre">BaseSet)</span></code>.</p> <p>The set classes are implemented using dictionaries. Accordingly, the requirements for set elements are the same as those for dictionary keys; namely, that the element defines both <a class="reference internal" href="../reference/datamodel.html#object.__eq__" title="object.__eq__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__eq__()</span></code></a> and <a class="reference internal" href="../reference/datamodel.html#object.__hash__" title="object.__hash__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__hash__()</span></code></a>. As a result, sets cannot contain mutable elements such as lists or dictionaries. However, they can contain immutable collections such as tuples or instances of <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a>. For convenience in implementing sets of sets, inner sets are automatically converted to immutable form, for example, <code class="docutils literal notranslate"><span class="pre">Set([Set(['dog'])])</span></code> is transformed to <code class="docutils literal notranslate"><span class="pre">Set([ImmutableSet(['dog'])])</span></code>.</p> <dl class="class"> <dt id="sets.Set"> <em class="property">class </em><code class="descclassname">sets.</code><code class="descname">Set</code><span class="sig-paren">(</span><span class="optional">[</span><em>iterable</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#sets.Set" title="Permalink to this definition">¶</a></dt> <dd><p>Constructs a new empty <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> object. If the optional <em>iterable</em> parameter is supplied, updates the set with elements obtained from iteration. All of the elements in <em>iterable</em> should be immutable or be transformable to an immutable using the protocol described in section <a class="reference internal" href="#immutable-transforms"><span class="std std-ref">Protocol for automatic conversion to immutable</span></a>.</p> </dd></dl> <dl class="class"> <dt id="sets.ImmutableSet"> <em class="property">class </em><code class="descclassname">sets.</code><code class="descname">ImmutableSet</code><span class="sig-paren">(</span><span class="optional">[</span><em>iterable</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#sets.ImmutableSet" title="Permalink to this definition">¶</a></dt> <dd><p>Constructs a new empty <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> object. If the optional <em>iterable</em> parameter is supplied, updates the set with elements obtained from iteration. All of the elements in <em>iterable</em> should be immutable or be transformable to an immutable using the protocol described in section <a class="reference internal" href="#immutable-transforms"><span class="std std-ref">Protocol for automatic conversion to immutable</span></a>.</p> <p>Because <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> objects provide a <a class="reference internal" href="../reference/datamodel.html#object.__hash__" title="object.__hash__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__hash__()</span></code></a> method, they can be used as set elements or as dictionary keys. <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> objects do not have methods for adding or removing elements, so all of the elements must be known when the constructor is called.</p> </dd></dl> <div class="section" id="set-objects"> <span id="id1"></span><h2>8.7.1. Set Objects<a class="headerlink" href="#set-objects" title="Permalink to this headline">¶</a></h2> <p>Instances of <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> and <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> both provide the following operations:</p> <table border="1" class="docutils"> <colgroup> <col width="41%" /> <col width="16%" /> <col width="43%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Operation</th> <th class="head">Equivalent</th> <th class="head">Result</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">len(s)</span></code></td> <td> </td> <td>number of elements in set <em>s</em> (cardinality)</td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">in</span> <span class="pre">s</span></code></td> <td> </td> <td>test <em>x</em> for membership in <em>s</em></td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">not</span> <span class="pre">in</span> <span class="pre">s</span></code></td> <td> </td> <td>test <em>x</em> for non-membership in <em>s</em></td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.issubset(t)</span></code></td> <td><code class="docutils literal notranslate"><span class="pre">s</span> <span class="pre"><=</span> <span class="pre">t</span></code></td> <td>test whether every element in <em>s</em> is in <em>t</em></td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.issuperset(t)</span></code></td> <td><code class="docutils literal notranslate"><span class="pre">s</span> <span class="pre">>=</span> <span class="pre">t</span></code></td> <td>test whether every element in <em>t</em> is in <em>s</em></td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.union(t)</span></code></td> <td><code class="docutils literal notranslate"><span class="pre">s</span> <span class="pre">|</span> <span class="pre">t</span></code></td> <td>new set with elements from both <em>s</em> and <em>t</em></td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.intersection(t)</span></code></td> <td><code class="docutils literal notranslate"><span class="pre">s</span> <span class="pre">&</span> <span class="pre">t</span></code></td> <td>new set with elements common to <em>s</em> and <em>t</em></td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.difference(t)</span></code></td> <td><code class="docutils literal notranslate"><span class="pre">s</span> <span class="pre">-</span> <span class="pre">t</span></code></td> <td>new set with elements in <em>s</em> but not in <em>t</em></td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.symmetric_difference(t)</span></code></td> <td><code class="docutils literal notranslate"><span class="pre">s</span> <span class="pre">^</span> <span class="pre">t</span></code></td> <td>new set with elements in either <em>s</em> or <em>t</em> but not both</td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.copy()</span></code></td> <td> </td> <td>new set with a shallow copy of <em>s</em></td> </tr> </tbody> </table> <p>Note, the non-operator versions of <code class="xref py py-meth docutils literal notranslate"><span class="pre">union()</span></code>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">intersection()</span></code>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">difference()</span></code>, and <code class="xref py py-meth docutils literal notranslate"><span class="pre">symmetric_difference()</span></code> will accept any iterable as an argument. In contrast, their operator based counterparts require their arguments to be sets. This precludes error-prone constructions like <code class="docutils literal notranslate"><span class="pre">Set('abc')</span> <span class="pre">&</span> <span class="pre">'cbs'</span></code> in favor of the more readable <code class="docutils literal notranslate"><span class="pre">Set('abc').intersection('cbs')</span></code>.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.3.1: </span>Formerly all arguments were required to be sets.</p> </div> <p>In addition, both <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> and <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> support set to set comparisons. Two sets are equal if and only if every element of each set is contained in the other (each is a subset of the other). A set is less than another set if and only if the first set is a proper subset of the second set (is a subset, but is not equal). A set is greater than another set if and only if the first set is a proper superset of the second set (is a superset, but is not equal).</p> <p>The subset and equality comparisons do not generalize to a complete ordering function. For example, any two disjoint sets are not equal and are not subsets of each other, so <em>all</em> of the following return <code class="docutils literal notranslate"><span class="pre">False</span></code>: <code class="docutils literal notranslate"><span class="pre">a<b</span></code>, <code class="docutils literal notranslate"><span class="pre">a==b</span></code>, or <code class="docutils literal notranslate"><span class="pre">a>b</span></code>. Accordingly, sets do not implement the <a class="reference internal" href="../reference/datamodel.html#object.__cmp__" title="object.__cmp__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__cmp__()</span></code></a> method.</p> <p>Since sets only define partial ordering (subset relationships), the output of the <code class="xref py py-meth docutils literal notranslate"><span class="pre">list.sort()</span></code> method is undefined for lists of sets.</p> <p>The following table lists operations available in <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> but not found in <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a>:</p> <table border="1" class="docutils"> <colgroup> <col width="30%" /> <col width="70%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Operation</th> <th class="head">Result</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">hash(s)</span></code></td> <td>returns a hash value for <em>s</em></td> </tr> </tbody> </table> <p>The following table lists operations available in <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> but not found in <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a>:</p> <table border="1" class="docutils"> <colgroup> <col width="45%" /> <col width="15%" /> <col width="39%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Operation</th> <th class="head">Equivalent</th> <th class="head">Result</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.update(t)</span></code></td> <td><em>s</em> |= <em>t</em></td> <td>return set <em>s</em> with elements added from <em>t</em></td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.intersection_update(t)</span></code></td> <td><em>s</em> &= <em>t</em></td> <td>return set <em>s</em> keeping only elements also found in <em>t</em></td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.difference_update(t)</span></code></td> <td><em>s</em> -= <em>t</em></td> <td>return set <em>s</em> after removing elements found in <em>t</em></td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.symmetric_difference_update(t)</span></code></td> <td><em>s</em> ^= <em>t</em></td> <td>return set <em>s</em> with elements from <em>s</em> or <em>t</em> but not both</td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.add(x)</span></code></td> <td> </td> <td>add element <em>x</em> to set <em>s</em></td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.remove(x)</span></code></td> <td> </td> <td>remove <em>x</em> from set <em>s</em>; raises <a class="reference internal" href="exceptions.html#exceptions.KeyError" title="exceptions.KeyError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">KeyError</span></code></a> if not present</td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.discard(x)</span></code></td> <td> </td> <td>removes <em>x</em> from set <em>s</em> if present</td> </tr> <tr class="row-odd"><td><code class="docutils literal notranslate"><span class="pre">s.pop()</span></code></td> <td> </td> <td>remove and return an arbitrary element from <em>s</em>; raises <a class="reference internal" href="exceptions.html#exceptions.KeyError" title="exceptions.KeyError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">KeyError</span></code></a> if empty</td> </tr> <tr class="row-even"><td><code class="docutils literal notranslate"><span class="pre">s.clear()</span></code></td> <td> </td> <td>remove all elements from set <em>s</em></td> </tr> </tbody> </table> <p>Note, the non-operator versions of <code class="xref py py-meth docutils literal notranslate"><span class="pre">update()</span></code>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">intersection_update()</span></code>, <code class="xref py py-meth docutils literal notranslate"><span class="pre">difference_update()</span></code>, and <code class="xref py py-meth docutils literal notranslate"><span class="pre">symmetric_difference_update()</span></code> will accept any iterable as an argument.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.3.1: </span>Formerly all arguments were required to be sets.</p> </div> <p>Also note, the module also includes a <code class="xref py py-meth docutils literal notranslate"><span class="pre">union_update()</span></code> method which is an alias for <code class="xref py py-meth docutils literal notranslate"><span class="pre">update()</span></code>. The method is included for backwards compatibility. Programmers should prefer the <code class="xref py py-meth docutils literal notranslate"><span class="pre">update()</span></code> method because it is supported by the built-in <a class="reference internal" href="stdtypes.html#set" title="set"><code class="xref py py-class docutils literal notranslate"><span class="pre">set()</span></code></a> and <a class="reference internal" href="stdtypes.html#frozenset" title="frozenset"><code class="xref py py-class docutils literal notranslate"><span class="pre">frozenset()</span></code></a> types.</p> </div> <div class="section" id="example"> <span id="set-example"></span><h2>8.7.2. Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">sets</span> <span class="k">import</span> <span class="n">Set</span> <span class="gp">>>> </span><span class="n">engineers</span> <span class="o">=</span> <span class="n">Set</span><span class="p">([</span><span class="s1">'John'</span><span class="p">,</span> <span class="s1">'Jane'</span><span class="p">,</span> <span class="s1">'Jack'</span><span class="p">,</span> <span class="s1">'Janice'</span><span class="p">])</span> <span class="gp">>>> </span><span class="n">programmers</span> <span class="o">=</span> <span class="n">Set</span><span class="p">([</span><span class="s1">'Jack'</span><span class="p">,</span> <span class="s1">'Sam'</span><span class="p">,</span> <span class="s1">'Susan'</span><span class="p">,</span> <span class="s1">'Janice'</span><span class="p">])</span> <span class="gp">>>> </span><span class="n">managers</span> <span class="o">=</span> <span class="n">Set</span><span class="p">([</span><span class="s1">'Jane'</span><span class="p">,</span> <span class="s1">'Jack'</span><span class="p">,</span> <span class="s1">'Susan'</span><span class="p">,</span> <span class="s1">'Zack'</span><span class="p">])</span> <span class="gp">>>> </span><span class="n">employees</span> <span class="o">=</span> <span class="n">engineers</span> <span class="o">|</span> <span class="n">programmers</span> <span class="o">|</span> <span class="n">managers</span> <span class="c1"># union</span> <span class="gp">>>> </span><span class="n">engineering_management</span> <span class="o">=</span> <span class="n">engineers</span> <span class="o">&</span> <span class="n">managers</span> <span class="c1"># intersection</span> <span class="gp">>>> </span><span class="n">fulltime_management</span> <span class="o">=</span> <span class="n">managers</span> <span class="o">-</span> <span class="n">engineers</span> <span class="o">-</span> <span class="n">programmers</span> <span class="c1"># difference</span> <span class="gp">>>> </span><span class="n">engineers</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="s1">'Marvin'</span><span class="p">)</span> <span class="c1"># add element</span> <span class="gp">>>> </span><span class="nb">print</span> <span class="n">engineers</span> <span class="go">Set(['Jane', 'Marvin', 'Janice', 'John', 'Jack'])</span> <span class="gp">>>> </span><span class="n">employees</span><span class="o">.</span><span class="n">issuperset</span><span class="p">(</span><span class="n">engineers</span><span class="p">)</span> <span class="c1"># superset test</span> <span class="go">False</span> <span class="gp">>>> </span><span class="n">employees</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">engineers</span><span class="p">)</span> <span class="c1"># update from another set</span> <span class="gp">>>> </span><span class="n">employees</span><span class="o">.</span><span class="n">issuperset</span><span class="p">(</span><span class="n">engineers</span><span class="p">)</span> <span class="go">True</span> <span class="gp">>>> </span><span class="k">for</span> <span class="n">group</span> <span class="ow">in</span> <span class="p">[</span><span class="n">engineers</span><span class="p">,</span> <span class="n">programmers</span><span class="p">,</span> <span class="n">managers</span><span class="p">,</span> <span class="n">employees</span><span class="p">]:</span> <span class="gp">... </span> <span class="n">group</span><span class="o">.</span><span class="n">discard</span><span class="p">(</span><span class="s1">'Susan'</span><span class="p">)</span> <span class="c1"># unconditionally remove element</span> <span class="gp">... </span> <span class="nb">print</span> <span class="n">group</span> <span class="gp">...</span> <span class="go">Set(['Jane', 'Marvin', 'Janice', 'John', 'Jack'])</span> <span class="go">Set(['Janice', 'Jack', 'Sam'])</span> <span class="go">Set(['Jane', 'Zack', 'Jack'])</span> <span class="go">Set(['Jack', 'Sam', 'Jane', 'Marvin', 'Janice', 'John', 'Zack'])</span> </pre></div> </div> </div> <div class="section" id="protocol-for-automatic-conversion-to-immutable"> <span id="immutable-transforms"></span><h2>8.7.3. Protocol for automatic conversion to immutable<a class="headerlink" href="#protocol-for-automatic-conversion-to-immutable" title="Permalink to this headline">¶</a></h2> <p>Sets can only contain immutable elements. For convenience, mutable <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> objects are automatically copied to an <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> before being added as a set element.</p> <p>The mechanism is to always add a <a class="reference internal" href="../glossary.html#term-hashable"><span class="xref std std-term">hashable</span></a> element, or if it is not hashable, the element is checked to see if it has an <code class="xref py py-meth docutils literal notranslate"><span class="pre">__as_immutable__()</span></code> method which returns an immutable equivalent.</p> <p>Since <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> objects have a <code class="xref py py-meth docutils literal notranslate"><span class="pre">__as_immutable__()</span></code> method returning an instance of <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a>, it is possible to construct sets of sets.</p> <p>A similar mechanism is needed by the <a class="reference internal" href="../reference/datamodel.html#object.__contains__" title="object.__contains__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__contains__()</span></code></a> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">remove()</span></code> methods which need to hash an element to check for membership in a set. Those methods check an element for hashability and, if not, check for a <code class="xref py py-meth docutils literal notranslate"><span class="pre">__as_temporarily_immutable__()</span></code> method which returns the element wrapped by a class that provides temporary methods for <a class="reference internal" href="../reference/datamodel.html#object.__hash__" title="object.__hash__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__hash__()</span></code></a>, <a class="reference internal" href="../reference/datamodel.html#object.__eq__" title="object.__eq__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__eq__()</span></code></a>, and <a class="reference internal" href="../reference/datamodel.html#object.__ne__" title="object.__ne__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__ne__()</span></code></a>.</p> <p>The alternate mechanism spares the need to build a separate copy of the original mutable object.</p> <p><a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> objects implement the <code class="xref py py-meth docutils literal notranslate"><span class="pre">__as_temporarily_immutable__()</span></code> method which returns the <a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> object wrapped by a new class <code class="xref py py-class docutils literal notranslate"><span class="pre">_TemporarilyImmutableSet</span></code>.</p> <p>The two mechanisms for adding hashability are normally invisible to the user; however, a conflict can arise in a multi-threaded environment where one thread is updating a set while another has temporarily wrapped it in <code class="xref py py-class docutils literal notranslate"><span class="pre">_TemporarilyImmutableSet</span></code>. In other words, sets of mutable sets are not thread-safe.</p> </div> <div class="section" id="comparison-to-the-built-in-set-types"> <span id="comparison-to-builtin-set"></span><h2>8.7.4. Comparison to the built-in <a class="reference internal" href="stdtypes.html#set" title="set"><code class="xref py py-class docutils literal notranslate"><span class="pre">set</span></code></a> types<a class="headerlink" href="#comparison-to-the-built-in-set-types" title="Permalink to this headline">¶</a></h2> <p>The built-in <a class="reference internal" href="stdtypes.html#set" title="set"><code class="xref py py-class docutils literal notranslate"><span class="pre">set</span></code></a> and <a class="reference internal" href="stdtypes.html#frozenset" title="frozenset"><code class="xref py py-class docutils literal notranslate"><span class="pre">frozenset</span></code></a> types were designed based on lessons learned from the <a class="reference internal" href="#module-sets" title="sets: Implementation of sets of unique elements. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sets</span></code></a> module. The key differences are:</p> <ul class="simple"> <li><a class="reference internal" href="#sets.Set" title="sets.Set"><code class="xref py py-class docutils literal notranslate"><span class="pre">Set</span></code></a> and <a class="reference internal" href="#sets.ImmutableSet" title="sets.ImmutableSet"><code class="xref py py-class docutils literal notranslate"><span class="pre">ImmutableSet</span></code></a> were renamed to <a class="reference internal" href="stdtypes.html#set" title="set"><code class="xref py py-class docutils literal notranslate"><span class="pre">set</span></code></a> and <a class="reference internal" href="stdtypes.html#frozenset" title="frozenset"><code class="xref py py-class docutils literal notranslate"><span class="pre">frozenset</span></code></a>.</li> <li>There is no equivalent to <code class="xref py py-class docutils literal notranslate"><span class="pre">BaseSet</span></code>. Instead, use <code class="docutils literal notranslate"><span class="pre">isinstance(x,</span> <span class="pre">(set,</span> <span class="pre">frozenset))</span></code>.</li> <li>The hash algorithm for the built-ins performs significantly better (fewer collisions) for most datasets.</li> <li>The built-in versions have more space efficient pickles.</li> <li>The built-in versions do not have a <code class="xref py py-meth docutils literal notranslate"><span class="pre">union_update()</span></code> method. Instead, use the <code class="xref py py-meth docutils literal notranslate"><span class="pre">update()</span></code> method which is equivalent.</li> <li>The built-in versions do not have a <code class="docutils literal notranslate"><span class="pre">_repr(sorted=True)</span></code> method. Instead, use the built-in <a class="reference internal" href="functions.html#repr" title="repr"><code class="xref py py-func docutils literal notranslate"><span class="pre">repr()</span></code></a> and <a class="reference internal" href="functions.html#sorted" title="sorted"><code class="xref py py-func docutils literal notranslate"><span class="pre">sorted()</span></code></a> functions: <code class="docutils literal notranslate"><span class="pre">repr(sorted(s))</span></code>.</li> <li>The built-in version does not have a protocol for automatic conversion to immutable. Many found this feature to be confusing and no one in the community reported having found real uses for it.</li> </ul> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">8.7. <code class="docutils literal notranslate"><span class="pre">sets</span></code> — Unordered collections of unique elements</a><ul> <li><a class="reference internal" href="#set-objects">8.7.1. Set Objects</a></li> <li><a class="reference internal" href="#example">8.7.2. Example</a></li> <li><a class="reference internal" href="#protocol-for-automatic-conversion-to-immutable">8.7.3. Protocol for automatic conversion to immutable</a></li> <li><a class="reference internal" href="#comparison-to-the-built-in-set-types">8.7.4. Comparison to the built-in <code class="docutils literal notranslate"><span class="pre">set</span></code> types</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="array.html" title="previous chapter">8.6. <code class="docutils literal notranslate"><span class="pre">array</span></code> — Efficient arrays of numeric values</a></p> <h4>Next topic</h4> <p class="topless"><a href="sched.html" title="next chapter">8.8. <code class="docutils literal notranslate"><span class="pre">sched</span></code> — Event scheduler</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/sets.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="sched.html" title="8.8. sched — Event scheduler" >next</a> |</li> <li class="right" > <a href="array.html" title="8.6. array — Efficient arrays of numeric values" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="datatypes.html" >8. Data Types</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2019, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Mar 27, 2019. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.7.6. </div> </body> </html>