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2to3.html
49.27
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__builtin__.html
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__future__.html
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__main__.html
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abc.html
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aepack.html
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aetools.html
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aetypes.html
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aifc.html
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al.html
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allos.html
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anydbm.html
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archiving.html
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argparse.html
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array.html
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ast.html
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asynchat.html
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asyncore.html
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atexit.html
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audioop.html
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autogil.html
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base64.html
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basehttpserver.html
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bastion.html
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bdb.html
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binascii.html
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binhex.html
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bisect.html
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bsddb.html
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bz2.html
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calendar.html
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carbon.html
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cd.html
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cgi.html
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cgihttpserver.html
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cgitb.html
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chunk.html
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cmath.html
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cmd.html
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code.html
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codecs.html
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codeop.html
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collections.html
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colorpicker.html
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colorsys.html
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commands.html
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compileall.html
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compiler.html
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configparser.html
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constants.html
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contextlib.html
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cookie.html
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cookielib.html
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copy.html
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copy_reg.html
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crypt.html
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crypto.html
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csv.html
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ctypes.html
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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
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development.html
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difflib.html
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dircache.html
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dis.html
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distutils.html
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dl.html
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doctest.html
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docxmlrpcserver.html
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dumbdbm.html
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dummy_thread.html
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dummy_threading.html
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easydialogs.html
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email-examples.html
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email.charset.html
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email.encoders.html
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email.errors.html
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email.generator.html
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email.header.html
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email.html
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email.iterators.html
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email.message.html
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email.mime.html
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email.parser.html
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email.util.html
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errno.html
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exceptions.html
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fcntl.html
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filecmp.html
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fileformats.html
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fileinput.html
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filesys.html
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fl.html
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fm.html
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fnmatch.html
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formatter.html
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fpectl.html
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fpformat.html
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fractions.html
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framework.html
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frameworks.html
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ftplib.html
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functions.html
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functools.html
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future_builtins.html
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gc.html
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gdbm.html
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gensuitemodule.html
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getopt.html
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getpass.html
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gettext.html
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gl.html
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glob.html
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grp.html
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gzip.html
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hashlib.html
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heapq.html
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hmac.html
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hotshot.html
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htmllib.html
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htmlparser.html
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httplib.html
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i18n.html
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ic.html
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idle.html
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imageop.html
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imaplib.html
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imgfile.html
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imghdr.html
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imp.html
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importlib.html
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imputil.html
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index.html
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inspect.html
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internet.html
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intro.html
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io.html
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ipc.html
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itertools.html
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jpeg.html
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json.html
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keyword.html
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language.html
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linecache.html
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locale.html
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logging.config.html
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logging.handlers.html
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logging.html
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mac.html
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macos.html
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macosa.html
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macostools.html
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macpath.html
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mailbox.html
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mailcap.html
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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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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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os.html
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os.path.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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poplib.html
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posix.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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shlex.html
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shutil.html
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signal.html
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simplehttpserver.html
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site.html
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smtpd.html
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smtplib.html
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sndhdr.html
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socket.html
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socketserver.html
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someos.html
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spwd.html
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sqlite3.html
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ssl.html
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stat.html
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statvfs.html
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stdtypes.html
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string.html
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stringio.html
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stringprep.html
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strings.html
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struct.html
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subprocess.html
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sun.html
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symbol.html
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sys.html
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test.html
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textwrap.html
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threading.html
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time.html
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tix.html
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tk.html
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tkinter.html
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token.html
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tokenize.html
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trace.html
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traceback.html
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ttk.html
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tty.html
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turtle.html
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types.html
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undoc.html
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unittest.html
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unix.html
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urllib.html
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urllib2.html
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urlparse.html
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user.html
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userdict.html
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uuid.html
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warnings.html
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wave.html
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weakref.html
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webbrowser.html
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whichdb.html
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windows.html
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xml.dom.html
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xml.html
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xml.sax.handler.html
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xml.sax.html
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xmlrpclib.html
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zipfile.html
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zipimport.html
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zlib.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="Content-Type" content="text/html; charset=utf-8" /> <title>34.2. msvcrt – Useful routines from the MS VC++ runtime — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </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 2.7.5 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python 2.7.5 documentation" href="../index.html" /> <link rel="up" title="34. 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MS Windows Specific Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-msvcrt"> <span id="msvcrt-useful-routines-from-the-ms-vc-runtime"></span><h1>34.2. <a class="reference internal" href="#module-msvcrt" title="msvcrt: Miscellaneous useful routines from the MS VC++ runtime. (Windows)"><tt class="xref py py-mod docutils literal"><span class="pre">msvcrt</span></tt></a> – Useful routines from the MS VC++ runtime<a class="headerlink" href="#module-msvcrt" title="Permalink to this headline">¶</a></h1> <p>These functions provide access to some useful capabilities on Windows platforms. Some higher-level modules use these functions to build the Windows implementations of their services. For example, the <a class="reference internal" href="getpass.html#module-getpass" title="getpass: Portable reading of passwords and retrieval of the userid."><tt class="xref py py-mod docutils literal"><span class="pre">getpass</span></tt></a> module uses this in the implementation of the <a class="reference internal" href="getpass.html#module-getpass" title="getpass: Portable reading of passwords and retrieval of the userid."><tt class="xref py py-func docutils literal"><span class="pre">getpass()</span></tt></a> function.</p> <p>Further documentation on these functions can be found in the Platform API documentation.</p> <p>The module implements both the normal and wide char variants of the console I/O api. The normal API deals only with ASCII characters and is of limited use for internationalized applications. The wide char API should be used where ever possible</p> <div class="section" id="file-operations"> <span id="msvcrt-files"></span><h2>34.2.1. File Operations<a class="headerlink" href="#file-operations" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="msvcrt.locking"> <tt class="descclassname">msvcrt.</tt><tt class="descname">locking</tt><big>(</big><em>fd</em>, <em>mode</em>, <em>nbytes</em><big>)</big><a class="headerlink" href="#msvcrt.locking" title="Permalink to this definition">¶</a></dt> <dd><p>Lock part of a file based on file descriptor <em>fd</em> from the C runtime. Raises <a class="reference internal" href="exceptions.html#exceptions.IOError" title="exceptions.IOError"><tt class="xref py py-exc docutils literal"><span class="pre">IOError</span></tt></a> on failure. The locked region of the file extends from the current file position for <em>nbytes</em> bytes, and may continue beyond the end of the file. <em>mode</em> must be one of the <tt class="xref py py-const docutils literal"><span class="pre">LK_*</span></tt> constants listed below. Multiple regions in a file may be locked at the same time, but may not overlap. Adjacent regions are not merged; they must be unlocked individually.</p> </dd></dl> <dl class="data"> <dt id="msvcrt.LK_LOCK"> <tt class="descclassname">msvcrt.</tt><tt class="descname">LK_LOCK</tt><a class="headerlink" href="#msvcrt.LK_LOCK" title="Permalink to this definition">¶</a></dt> <dt id="msvcrt.LK_RLCK"> <tt class="descclassname">msvcrt.</tt><tt class="descname">LK_RLCK</tt><a class="headerlink" href="#msvcrt.LK_RLCK" title="Permalink to this definition">¶</a></dt> <dd><p>Locks the specified bytes. If the bytes cannot be locked, the program immediately tries again after 1 second. If, after 10 attempts, the bytes cannot be locked, <a class="reference internal" href="exceptions.html#exceptions.IOError" title="exceptions.IOError"><tt class="xref py py-exc docutils literal"><span class="pre">IOError</span></tt></a> is raised.</p> </dd></dl> <dl class="data"> <dt id="msvcrt.LK_NBLCK"> <tt class="descclassname">msvcrt.</tt><tt class="descname">LK_NBLCK</tt><a class="headerlink" href="#msvcrt.LK_NBLCK" title="Permalink to this definition">¶</a></dt> <dt id="msvcrt.LK_NBRLCK"> <tt class="descclassname">msvcrt.</tt><tt class="descname">LK_NBRLCK</tt><a class="headerlink" href="#msvcrt.LK_NBRLCK" title="Permalink to this definition">¶</a></dt> <dd><p>Locks the specified bytes. If the bytes cannot be locked, <a class="reference internal" href="exceptions.html#exceptions.IOError" title="exceptions.IOError"><tt class="xref py py-exc docutils literal"><span class="pre">IOError</span></tt></a> is raised.</p> </dd></dl> <dl class="data"> <dt id="msvcrt.LK_UNLCK"> <tt class="descclassname">msvcrt.</tt><tt class="descname">LK_UNLCK</tt><a class="headerlink" href="#msvcrt.LK_UNLCK" title="Permalink to this definition">¶</a></dt> <dd><p>Unlocks the specified bytes, which must have been previously locked.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.setmode"> <tt class="descclassname">msvcrt.</tt><tt class="descname">setmode</tt><big>(</big><em>fd</em>, <em>flags</em><big>)</big><a class="headerlink" href="#msvcrt.setmode" title="Permalink to this definition">¶</a></dt> <dd><p>Set the line-end translation mode for the file descriptor <em>fd</em>. To set it to text mode, <em>flags</em> should be <a class="reference internal" href="os.html#os.O_TEXT" title="os.O_TEXT"><tt class="xref py py-const docutils literal"><span class="pre">os.O_TEXT</span></tt></a>; for binary, it should be <a class="reference internal" href="os.html#os.O_BINARY" title="os.O_BINARY"><tt class="xref py py-const docutils literal"><span class="pre">os.O_BINARY</span></tt></a>.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.open_osfhandle"> <tt class="descclassname">msvcrt.</tt><tt class="descname">open_osfhandle</tt><big>(</big><em>handle</em>, <em>flags</em><big>)</big><a class="headerlink" href="#msvcrt.open_osfhandle" title="Permalink to this definition">¶</a></dt> <dd><p>Create a C runtime file descriptor from the file handle <em>handle</em>. The <em>flags</em> parameter should be a bitwise OR of <a class="reference internal" href="os.html#os.O_APPEND" title="os.O_APPEND"><tt class="xref py py-const docutils literal"><span class="pre">os.O_APPEND</span></tt></a>, <a class="reference internal" href="os.html#os.O_RDONLY" title="os.O_RDONLY"><tt class="xref py py-const docutils literal"><span class="pre">os.O_RDONLY</span></tt></a>, and <a class="reference internal" href="os.html#os.O_TEXT" title="os.O_TEXT"><tt class="xref py py-const docutils literal"><span class="pre">os.O_TEXT</span></tt></a>. The returned file descriptor may be used as a parameter to <a class="reference internal" href="os.html#os.fdopen" title="os.fdopen"><tt class="xref py py-func docutils literal"><span class="pre">os.fdopen()</span></tt></a> to create a file object.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.get_osfhandle"> <tt class="descclassname">msvcrt.</tt><tt class="descname">get_osfhandle</tt><big>(</big><em>fd</em><big>)</big><a class="headerlink" href="#msvcrt.get_osfhandle" title="Permalink to this definition">¶</a></dt> <dd><p>Return the file handle for the file descriptor <em>fd</em>. Raises <a class="reference internal" href="exceptions.html#exceptions.IOError" title="exceptions.IOError"><tt class="xref py py-exc docutils literal"><span class="pre">IOError</span></tt></a> if <em>fd</em> is not recognized.</p> </dd></dl> </div> <div class="section" id="console-i-o"> <span id="msvcrt-console"></span><h2>34.2.2. Console I/O<a class="headerlink" href="#console-i-o" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="msvcrt.kbhit"> <tt class="descclassname">msvcrt.</tt><tt class="descname">kbhit</tt><big>(</big><big>)</big><a class="headerlink" href="#msvcrt.kbhit" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if a keypress is waiting to be read.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.getch"> <tt class="descclassname">msvcrt.</tt><tt class="descname">getch</tt><big>(</big><big>)</big><a class="headerlink" href="#msvcrt.getch" title="Permalink to this definition">¶</a></dt> <dd><p>Read a keypress and return the resulting character. Nothing is echoed to the console. This call will block if a keypress is not already available, but will not wait for <tt class="kbd docutils literal"><span class="pre">Enter</span></tt> to be pressed. If the pressed key was a special function key, this will return <tt class="docutils literal"><span class="pre">'\000'</span></tt> or <tt class="docutils literal"><span class="pre">'\xe0'</span></tt>; the next call will return the keycode. The <tt class="kbd docutils literal"><span class="pre">Control-C</span></tt> keypress cannot be read with this function.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.getwch"> <tt class="descclassname">msvcrt.</tt><tt class="descname">getwch</tt><big>(</big><big>)</big><a class="headerlink" href="#msvcrt.getwch" title="Permalink to this definition">¶</a></dt> <dd><p>Wide char variant of <a class="reference internal" href="#msvcrt.getch" title="msvcrt.getch"><tt class="xref py py-func docutils literal"><span class="pre">getch()</span></tt></a>, returning a Unicode value.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="function"> <dt id="msvcrt.getche"> <tt class="descclassname">msvcrt.</tt><tt class="descname">getche</tt><big>(</big><big>)</big><a class="headerlink" href="#msvcrt.getche" title="Permalink to this definition">¶</a></dt> <dd><p>Similar to <a class="reference internal" href="#msvcrt.getch" title="msvcrt.getch"><tt class="xref py py-func docutils literal"><span class="pre">getch()</span></tt></a>, but the keypress will be echoed if it represents a printable character.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.getwche"> <tt class="descclassname">msvcrt.</tt><tt class="descname">getwche</tt><big>(</big><big>)</big><a class="headerlink" href="#msvcrt.getwche" title="Permalink to this definition">¶</a></dt> <dd><p>Wide char variant of <a class="reference internal" href="#msvcrt.getche" title="msvcrt.getche"><tt class="xref py py-func docutils literal"><span class="pre">getche()</span></tt></a>, returning a Unicode value.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="function"> <dt id="msvcrt.putch"> <tt class="descclassname">msvcrt.</tt><tt class="descname">putch</tt><big>(</big><em>char</em><big>)</big><a class="headerlink" href="#msvcrt.putch" title="Permalink to this definition">¶</a></dt> <dd><p>Print the character <em>char</em> to the console without buffering.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.putwch"> <tt class="descclassname">msvcrt.</tt><tt class="descname">putwch</tt><big>(</big><em>unicode_char</em><big>)</big><a class="headerlink" href="#msvcrt.putwch" title="Permalink to this definition">¶</a></dt> <dd><p>Wide char variant of <a class="reference internal" href="#msvcrt.putch" title="msvcrt.putch"><tt class="xref py py-func docutils literal"><span class="pre">putch()</span></tt></a>, accepting a Unicode value.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> <dl class="function"> <dt id="msvcrt.ungetch"> <tt class="descclassname">msvcrt.</tt><tt class="descname">ungetch</tt><big>(</big><em>char</em><big>)</big><a class="headerlink" href="#msvcrt.ungetch" title="Permalink to this definition">¶</a></dt> <dd><p>Cause the character <em>char</em> to be “pushed back” into the console buffer; it will be the next character read by <a class="reference internal" href="#msvcrt.getch" title="msvcrt.getch"><tt class="xref py py-func docutils literal"><span class="pre">getch()</span></tt></a> or <a class="reference internal" href="#msvcrt.getche" title="msvcrt.getche"><tt class="xref py py-func docutils literal"><span class="pre">getche()</span></tt></a>.</p> </dd></dl> <dl class="function"> <dt id="msvcrt.ungetwch"> <tt class="descclassname">msvcrt.</tt><tt class="descname">ungetwch</tt><big>(</big><em>unicode_char</em><big>)</big><a class="headerlink" href="#msvcrt.ungetwch" title="Permalink to this definition">¶</a></dt> <dd><p>Wide char variant of <a class="reference internal" href="#msvcrt.ungetch" title="msvcrt.ungetch"><tt class="xref py py-func docutils literal"><span class="pre">ungetch()</span></tt></a>, accepting a Unicode value.</p> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> </dd></dl> </div> <div class="section" id="other-functions"> <span id="msvcrt-other"></span><h2>34.2.3. Other Functions<a class="headerlink" href="#other-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="msvcrt.heapmin"> <tt class="descclassname">msvcrt.</tt><tt class="descname">heapmin</tt><big>(</big><big>)</big><a class="headerlink" href="#msvcrt.heapmin" title="Permalink to this definition">¶</a></dt> <dd><p>Force the <tt class="xref c c-func docutils literal"><span class="pre">malloc()</span></tt> heap to clean itself up and return unused blocks to the operating system. On failure, this raises <a class="reference internal" href="exceptions.html#exceptions.IOError" title="exceptions.IOError"><tt class="xref py py-exc docutils literal"><span class="pre">IOError</span></tt></a>.</p> </dd></dl> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">34.2. <tt class="docutils literal"><span class="pre">msvcrt</span></tt> – Useful routines from the MS VC++ runtime</a><ul> <li><a class="reference internal" href="#file-operations">34.2.1. File Operations</a></li> <li><a class="reference internal" href="#console-i-o">34.2.2. Console I/O</a></li> <li><a class="reference internal" href="#other-functions">34.2.3. Other Functions</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="msilib.html" title="previous chapter">34.1. <tt class="docutils literal"><span class="pre">msilib</span></tt> — Read and write Microsoft Installer files</a></p> <h4>Next topic</h4> <p class="topless"><a href="_winreg.html" title="next chapter">34.3. <tt class="docutils literal"><span class="pre">_winreg</span></tt> – Windows registry access</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/msvcrt.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <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> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <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="_winreg.html" title="34.3. _winreg – Windows registry access" >next</a> |</li> <li class="right" > <a href="msilib.html" title="34.1. msilib — Read and write Microsoft Installer files" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="windows.html" >34. 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