一个不错的搜索Example的网站：http://www.programcreek.com/python/
通过分析github上5000个开源python项目，找出最常用的库。下面是前670个。括号里的数字代表出现的频率，最大为5000。
1.os (2810)
2.sys (2563)
3.re (1986)
4.time (1478)
5.logging (1080)
6.datetime (1032)
7.unittest (960)
8.random (891)
9.urllib (776)
10.os.path (723)
11.string (659)
12.math (560)
13.socket (556)
14.types (548)
15.subprocess (529)
16.tempfile (492)
17.shutil (484)
18.threading (475)
19.traceback (473)
20.urllib2 (472)
21.copy (455)
22.cgi (425)
23.struct (420)
24.warnings (412)
25.base64 (398)
26.urlparse (377)
27.codecs (365)
28.itertools (328)
29.glob (322)
30.inspect (310)
31.operator (309)
32.StringIO (304)
33.errno (302)
34.optparse (298)
35.hashlib (288)
36.httplib (271)
37.json (269)
38.pickle (251)
39.signal (248)
40.getopt (236)
41.csv (218)
42.mimetypes (205)
43.ConfigParser (202)
44.settings (198)
45.simplejson (197)
46.gtk (188)
47.imp (183)
48.pprint (178)
49.zipfile (174)
50.textwrap (170)
51.hmac (168)
52.uuid (167)
53.stat (166)
54.numpy (165)
55.weakref (164)
56.fnmatch (163)
57.locale (158)
58.binascii (157)
59.calendar (156)
60.cStringIO (154)
61.django (153)
62.md5 (152)
63.getpass (151)
64.thread (151)
65.select (147)
66.Queue (143)
67.platform (138)
68.gobject (133)
69.gzip (133)
70.config (130)
71.collections (130)
72.doctest (127)
73.utils (124)
74.smtplib (124)
75.__builtin__ (123)
76.cPickle (123)
77.commands (121)
78.yaml (118)
79.xmlrpclib (117)
80.atexit (114)
81.zlib (111)
82.functools (110)
83.pkg_resources (110)
84.gettext (109)
85.util (106)
86.sqlite3 (102)
87.decimal (102)
88.array (101)
89.sgmllib (100)
90.cgitb (100)
91.posixpath (100)
92.wsgiref.handlers (98)
93.gc (95)
94.sha (90)
95.pdb (90)
96.unicodedata (90)
97.tarfile (88)
98.ctypes (88)
99.models (87)
100.htmlentitydefs (86)
101.pygtk (84)
102.exceptions (83)
103.Image (81)
104.new (78)
105.rfc822 (78)
106.pygame (77)
107.wx (77)
108.MySQLdb (76)
109.feedparser (74)
110.difflib (73)
111.asyncore (72)
112.shlex (72)
113.Cookie (69)
114.matplotlib (68)
115.argparse (68)
116.marshal (65)
117.__future__ (64)
118.email (63)
119.bisect (62)
120.shelve (62)
121.pstats (61)
122.BaseHTTPServer (60)
123.nose (59)
124.webbrowser (59)
125.fcntl (59)
126.tokenize (58)
127.tagging (25)
196.psycopg2 (25)
197.atom (25)
198.oauth (25)
199.filecmp (25)
200.dis (25)
201.glib (24)
202.logging.config (23)
203.appengine_django (23)
204.gdata (23)
205.gst (23)
206.fields (23)
207.requests (22)
208.ops (22)
209.cryptomath (22)
210.testdata (22)
211.gdata.apps (22)
212.gdata.docs (22)
213.Python_AES (22)
214.pyglet (22)
215.xml (22)
216.mathtls (22)
217.py (22)
218.pymongo (22)
219.redis (20)
233.httpserver (20)
234.ldap (20)
235.win32event (20)
236.formencode (19)
237.BeautifulSoup (19)
238.SimpleXMLRPCServer (19)
239.gconf (19)
240.html5lib (19)
241.pygments (19)
242.test (19)
243.symbol (18)
244.pkgutil (18)
245.copy_reg (18)
246.session (18)
247.mechanize (18)
248.net (18)
249.html4 (18)
250.treeprocessors (18)
251.SimpleHTTPServer (18)
252.relativedelta (18)
253.errors (18)
254.postprocessors (18)
255.preprocessors (18)
256.PIL.Image (18)
257.multifile (17)
258.ast (17)
259.pinax (17)
260.colorsys (17)
261.document (17)
262.syslog (17)
263.plistlib (17)
264.tools (17)
265.db (17)
266.handler (16)
267.url_manager (16)
268.tkMessageBox (16)
269.resource (16)
270.log (16)
271.ssl (15)
272.bottle (15)
273.wsgiref.util (15)
274.profile (15)
275.ElementTree (15)
276.Numeric (15)
277.win32serviceutil (15)
278.keyword (15)
279.robot_abstract (15)
280.py_compile (15)
281.poplib (15)
282.main (15)
283.win32gui (15)
284.clr (15)
285.pywintypes (14)
286.core (14)
287.misc (14)
288.nltk (14)
289.importlib (14)
290.coverage (14)
291.cmath (14)
292.paramiko (14)
293.pexpect (14)
294.uu (14)
295.openid (14)
296.couchdb (11)
362.pynotify (11)
363.discoverdata (11)
364.cv (11)
365.forms (11)
366._beautifulsoup (11)
367.datadriven (11)
368.termios (11)
369.SCons.Tool (11)
370.nose.case (11)
371.bdb (10)
372.mergejs (10)
373.sunaudio (10)
374.xmpp (8)
461.options (8)
462.uploadhandler (8)
463.connection (8)
464.support (8)
465.robot (8)
466.paste.fixture (8)
467._hotshot (8)
468.msilib (8)
469.gedit (8)
470.threadinglocal (8)
471.ShUtil (7)
472.mozrunner (7)
473.SCons.SConf (7)
474.rpc (7)
475.ProgressBar (7)
476.__init__ (7)
477.zc.buildout (7)
478.gviz_api (7)
479.LitConfig (7)
480.aixcc (7)
481.pip (7)
482.interface (7)
483.stubout (7)
484.SCons.Options (7)
485.link (7)
486.blip (7)
487.backend (7)
488.rospy (7)
489.wsgiref.headers (7)
490.SCons.Platform (7)
491.SCons.SConsign (7)
492.SCons.Subst (7)
493.SCons.Executor (7)
494.lib (7)
495.paste.fileapp (7)
496.distutils.dir_util (7)
497.metadata (7)
498.ntpath (7)
499.smtpd (7)
500.input (7)
501.SCons.CacheDir (7)
502.gdb (7)
503.ui (7)
504.pp (7)
505.SCons.PathList (7)
506.foo (7)
507.evalcontext (7)
508.groc (7)
509.wsgi_intercept (7)
510.SCons.Taskmaster (7)
511.f77 (7)
512.pyamf (7)
513.chardet (7)
514.graph (7)
515.static (7)
516.build (7)
517.wavelet (7)
518.element (7)
519.pymc (6)
520.database (6)
521.test_utils (6)
522.nose.config (6)
523.planet (6)
524.common_lint (6)
525.urlconf_outer (6)
526.IPython.ipapi (6)
527.robotparser (6)
528.genericpath (6)
529.sqlite (6)
530.Carbon.File (6)
531.ioloop (6)
532.IPython (6)
533.cssutils (6)
534.lex (6)
535.gnome (6)
536.ossaudiodev (6)
537.scipy.special (6)
538.docutils.core (6)
539.player (6)
540.routes (6)
541._multiprocessing (6)
542.jarray (6)
543.auth (6)
544.flickrapi (6)
545.anyjson (6)
546.ZSI (6)
547.urlconf_inner (6)
548.h5py (6)
549.interfaces (6)
550.UserString (6)
551.consts (6)
552.sre_compile (6)
553._ctypes_test (6)
554.reflect (6)
555.yql (6)
556.tkFileDialog (6)
557.qt (6)
558.wx.aui (6)
559.statistics (6)
560.gmock_test_utils (6)
561.irclib (6)
562.xbmc (6)
563.engine (6)
564.stackless (6)
565.Options (6)
566.status (6)
567.ansi (6)
568.pyclbr (6)
569.pyinotify (6)
570.gdbm (5)
571.django_filters (5)
572.win32process (5)
573.audioop (5)
574.plugins (5)
575.debug (5)
576.wave (5)
577.nose.selector (5)
578.mx.DateTime (5)
579.serializers (5)
580.pluginlib (5)
581.reports (5)
582.pystache (5)
583.PyShell (5)
584.tz (5)
585.loader (5)
586.webtest (5)
587.BIFFRecords (5)
588.language (5)
589._mysql (5)
590.symtable (5)
591.System (5)
592.CosNaming (5)
593.distutils.tests (5)
594.env (5)
595.configuration (5)
596.cjson (5)
597.ImageDraw (5)
598.usb (5)
599.strop (5)
600.ipaddr (5)
601.scanner (5)
602.format (5)
603.http_server (5)
604.epydoc.docparser (5)
605.pysvn (5)
606.neo_cs (5)
607.haystack (5)
608.test_i18n (5)
609.crash_test_dummy (5)
610.xbmcgui (5)
611.manager (5)
612.Exceptions (5)
613.bpy (5)
614.sre (5)
615.win32com.client (5)
616._base (5)
617.zen_editor (5)
618.apt (5)
619.distutils.version (5)
620.app (5)
621.Pmw (5)
622.rpm (5)
623.Logs (5)
624.killableprocess (5)
625.epydoc (5)
626.bluetooth (5)
627.rexec (5)
628.modulefinder (5)
629.webhelpers (5)
630._strptime (5)
631.dircache (5)
632.epydoc.markup (5)
633.tidylib (5)
634.templates (5)
635.process (5)
636.OSC (5)
637.actions (5)
638.ihooks (5)
639.xlwt (5)
640.ipthelp (5)
641.distutils.dist (5)
642.txamqp.spec (5)
643.run_tests_util (5)
644.fractions (5)
645.treebuilders (5)
646.enchant (5)
647.win32pipe (5)
648.caching.base (5)
649.gnomevfs (5)
650.sphinx.roles (5)
651.markup (5)
652.release (5)
653.rrdtool (5)
654.test_default_server (5)
655.polib (5)
656.jingo (5)
657.nose.tools (5)
658.Pyro.core (5)
659.opcode (5)
660.webchecker (5)
661.match (5)
662.libvirt (5)
663.ExcelFormula (5)
664.taskqueue_service_pb (5)
665.maths (5)
666.Formatting (5)
667.portalocker (5)
668.objects (5)
669._testcapi (5)
670.cyclone.web (5)