- u-LAW, [1], [2]
 
    - ucd_3_2_0 (in module unicodedata)
 
    - udata (select.kevent attribute)
 
    - UF_APPEND (in module stat)
 
    - UF_COMPRESSED (in module stat)
 
    - UF_HIDDEN (in module stat)
 
    - UF_IMMUTABLE (in module stat)
 
    - UF_NODUMP (in module stat)
 
    - UF_NOUNLINK (in module stat)
 
    - UF_OPAQUE (in module stat)
 
    - uid (tarfile.TarInfo attribute)
 
    - uid() (imaplib.IMAP4 method)
 
    - uidl() (poplib.POP3 method)
 
    - ulaw2lin() (in module audioop)
 
    - ULONG_MAX
 
    - umask() (in module os)
 
    - unalias (pdb command)
 
    - uname (tarfile.TarInfo attribute)
 
    - uname() (in module os)
 
    
      - (in module platform)
 
    
    - unary
 
    
      - arithmetic operation
 
      - bitwise operation
 
    
    - UNARY_INVERT (opcode)
 
    - UNARY_NEGATIVE (opcode)
 
    - UNARY_NOT (opcode)
 
    - UNARY_POSITIVE (opcode)
 
    - unbinding
 
    
      - name
 
    
    - UnboundLocalError, [1]
 
    - unbuffered I/O
 
    - UNC paths
 
    
      - and os.makedirs()
 
    
    - unconsumed_tail (zlib.Decompress attribute)
 
    - unctrl() (in module curses)
 
    
      - (in module curses.ascii)
 
    
    - undefine_macro() (distutils.ccompiler.CCompiler method)
 
    - Underflow (class in decimal)
 
    - undisplay (pdb command)
 
    - undo() (in module turtle)
 
    - undobufferentries() (in module turtle)
 
    - undoc_header (cmd.Cmd attribute)
 
    - unescape() (in module xml.sax.saxutils)
 
    - UnexpectedException
 
    - unexpectedSuccesses (unittest.TestResult attribute)
 
    - unget_wch() (in module curses)
 
    - ungetch() (in module curses)
 
    
      - (in module msvcrt)
 
    
    - ungetmouse() (in module curses)
 
    - ungetwch() (in module msvcrt)
 
    - unhexlify() (in module binascii)
 
    - Unicode, [1], [2]
 
    
      - database
 
    
    - unicode (2to3 fixer)
 
    - Unicode Consortium
 
    - unicodedata (module)
 
    - UnicodeDecodeError
 
    - UnicodeEncodeError
 
    - UnicodeError
 
    - UnicodeTranslateError
 
    - UnicodeWarning
 
    - unidata_version (in module unicodedata)
 
    - unified_diff() (in module difflib)
 
    - uniform() (in module random)
 
    - UnimplementedFileMode
 
    - Union (class in ctypes)
 
    - union() (set method)
 
    - unittest (module)
 
    - unittest command line option
 
    
      - -b, --buffer
 
      - -c, --catch
 
      - -f, --failfast
 
    
    - unittest-discover command line option
 
    
      - -p, --pattern pattern
 
      - -s, --start-directory directory
 
      - -t, --top-level-directory directory
 
      - -v, --verbose
 
    
    - unittest.mock (module)
 
    - universal newlines
 
    
      - What's new, [1], [2], [3]
 
      - csv.reader function
 
      - importlib.abc.InspectLoader.get_source method
 
      - io.IncrementalNewlineDecoder class
 
      - io.TextIOWrapper class
 
      - open() built-in function
 
      - str.splitlines method
 
      - subprocess module
 
      - zipfile.ZipFile.open method
 
    
    - UNIX
 
    
      - I/O control
 
      - file control
 
    
    - unix_dialect (class in csv)
 
    - unknown_decl() (html.parser.HTMLParser method)
 
    - unknown_open() (urllib.request.BaseHandler method)
 
    
      - (urllib.request.UnknownHandler method)
 
    
    - UnknownHandler (class in urllib.request)
 
    - UnknownProtocol
 
    - UnknownTransferEncoding
 
    - unlink() (in module os)
 
    
      - (xml.dom.minidom.Node method)
 
    
    - unlock() (mailbox.Babyl method)
 
    
      - (mailbox.MH method)
 
      - (mailbox.MMDF method)
 
      - (mailbox.Mailbox method)
 
      - (mailbox.Maildir method)
 
      - (mailbox.mbox method)
 
    
    - unpack() (in module struct)
 
    
      - (struct.Struct method)
 
    
    - unpack_archive() (in module shutil)
 
    - unpack_array() (xdrlib.Unpacker method)
 
    - unpack_bytes() (xdrlib.Unpacker method)
 
    - unpack_double() (xdrlib.Unpacker method)
 
    - UNPACK_EX (opcode)
 
    - unpack_farray() (xdrlib.Unpacker method)
 
    - unpack_float() (xdrlib.Unpacker method)
 
    - unpack_fopaque() (xdrlib.Unpacker method)
 
    - unpack_from() (in module struct)
 
    
      - (struct.Struct method)
 
    
    - unpack_fstring() (xdrlib.Unpacker method)
 
    - unpack_list() (xdrlib.Unpacker method)
 
    - unpack_opaque() (xdrlib.Unpacker method)
 
    - UNPACK_SEQUENCE (opcode)
 
    - unpack_string() (xdrlib.Unpacker method)
 
    - Unpacker (class in xdrlib)
 
    - unparsedEntityDecl() (xml.sax.handler.DTDHandler method)
 
    - UnparsedEntityDeclHandler() (xml.parsers.expat.xmlparser method)
 
    - Unpickler (class in pickle)
 
    - UnpicklingError
 
    - unquote() (in module email.utils)
 
    
      - (in module urllib.parse)
 
    
    - unquote_plus() (in module urllib.parse)
 
    - unquote_to_bytes() (in module urllib.parse)
 
    - unreachable object
 
  | 
  
    - unreadline() (distutils.text_file.TextFile method)
 
    - unrecognized escape sequence
 
    - unregister() (in module atexit)
 
    
      - (in module faulthandler)
 
      - (select.devpoll method)
 
      - (select.epoll method)
 
      - (select.poll method)
 
    
    - unregister_archive_format() (in module shutil)
 
    - unregister_dialect() (in module csv)
 
    - unregister_unpack_format() (in module shutil)
 
    - unset() (test.support.EnvironmentVarGuard method)
 
    - unsetenv() (in module os)
 
    - UnstructuredHeader (class in email.headerregistry)
 
    - unsubscribe() (imaplib.IMAP4 method)
 
    - UnsupportedOperation
 
    - until (pdb command)
 
    - untokenize() (in module tokenize)
 
    - untouchwin() (curses.window method)
 
    - unused_data (bz2.BZ2Decompressor attribute)
 
    
      - (lzma.LZMADecompressor attribute)
 
      - (zlib.Decompress attribute)
 
    
    - unverifiable (urllib.request.Request attribute)
 
    - unwrap() (ssl.SSLSocket method)
 
    - up (pdb command)
 
    - up() (in module turtle)
 
    - update() (collections.Counter method)
 
    
      - (dict method)
 
      - (hashlib.hash method)
 
      - (hmac.HMAC method)
 
      - (in module turtle)
 
      - (mailbox.Mailbox method)
 
      - (mailbox.Maildir method)
 
      - (set method)
 
      - (trace.CoverageResults method)
 
    
    - update_panels() (in module curses.panel)
 
    - update_visible() (mailbox.BabylMessage method)
 
    - update_wrapper() (in module functools)
 
    - upper() (str method)
 
    - urandom() (in module os)
 
    - URL, [1], [2], [3]
 
    
      - parsing
 
      - relative
 
    
    - url (xmlrpc.client.ProtocolError attribute)
 
    - url2pathname() (in module urllib.request)
 
    - urlcleanup() (in module urllib.request)
 
    - urldefrag() (in module urllib.parse)
 
    - urlencode() (in module urllib.parse)
 
    - URLError
 
    - urljoin() (in module urllib.parse)
 
    - urllib (2to3 fixer)
 
    - urllib.error (module)
 
    - urllib.parse (module)
 
    - urllib.request
 
    
      - module
 
    
    - urllib.request (module)
 
    - urllib.response (module)
 
    - urllib.robotparser (module)
 
    - urlopen() (in module urllib.request)
 
    - URLopener (class in urllib.request)
 
    - urlparse() (in module urllib.parse)
 
    - urlretrieve() (in module urllib.request)
 
    - urlsafe_b64decode() (in module base64)
 
    - urlsafe_b64encode() (in module base64)
 
    - urlsplit() (in module urllib.parse)
 
    - urlunparse() (in module urllib.parse)
 
    - urlunsplit() (in module urllib.parse)
 
    - urn (uuid.UUID attribute)
 
    - use_default_colors() (in module curses)
 
    - use_env() (in module curses)
 
    - use_rawinput (cmd.Cmd attribute)
 
    - UseForeignDTD() (xml.parsers.expat.xmlparser method)
 
    - USER
 
    - user
 
    
      - effective id
 
      - id
 
      - id, setting
 
    
    - user() (poplib.POP3 method)
 
    - user-defined
 
    
      - function
 
      - function call
 
      - method
 
    
    - user-defined function
 
    
      - object, [1], [2]
 
    
    - user-defined method
 
    
      - object
 
    
    - USER_BASE
 
    
      - (in module site)
 
    
    - user_call() (bdb.Bdb method)
 
    - user_exception() (bdb.Bdb method)
 
    - user_line() (bdb.Bdb method)
 
    - user_return() (bdb.Bdb method)
 
    - USER_SITE (in module site)
 
    - usercustomize
 
    
      - module
 
    
    - UserDict (class in collections)
 
    - UserList (class in collections)
 
    - USERNAME, [1]
 
    - username (email.headerregistry.Address attribute)
 
    - USERPROFILE, [1]
 
    - userptr() (curses.panel.Panel method)
 
    - UserString (class in collections)
 
    - UserWarning
 
    - USTAR_FORMAT (in module tarfile)
 
    - UTC
 
    - utc (datetime.timezone attribute)
 
    - utcfromtimestamp() (datetime.datetime class method)
 
    - utcnow() (datetime.datetime class method)
 
    - utcoffset() (datetime.datetime method)
 
    
      - (datetime.time method)
 
      - (datetime.timezone method)
 
      - (datetime.tzinfo method)
 
    
    - utctimetuple() (datetime.datetime method)
 
    - utime() (in module os)
 
    - uu
 
    
      - module
 
    
    - uu (module)
 
    - UUID (class in uuid)
 
    - uuid (module)
 
    - uuid1
 
    - uuid1() (in module uuid)
 
    - uuid3
 
    - uuid3() (in module uuid)
 
    - uuid4
 
    - uuid4() (in module uuid)
 
    - uuid5
 
    - uuid5() (in module uuid)
 
    - UuidCreate() (in module msilib)
 
  |