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UDP echo servers 
UDPServer class 
ufunc object
    accumulate attribute 
    attributes 
    outer attribute 
    reduce attribute 
    reduceat attribute 
ufuncs (universal functions), Numeric module 
unalias command (pdb module) 
unbind method (Widget object) 
unbind_all method (Widget object) 
unbinding  [See references, unbinding]
unbound methods  2nd  [See also methods][See also methods]
UnboundLocalError exception 
undef_macros argument (distutils Extension class) 
underscore (_)
    class-private variables 
    gettext module 
    identifiers  2nd 
    interactive sessions 
    module-private variables 
    special methods 
ungetch function (msvcrt module) 
unichr function (built-in) 
Unicode
    alphanumeric designation 
    converting strings to 
UNICODE attribute (re module) 
Unicode Character Database 
__unicode__ special method 
Unicode strings  2nd 
    codecs module 
    encoding/decoding 
    as immutable sequences 
    Tkinter and 
unicode type (built-in)  2nd  3rd  4th 
unicodedata module 
UnicodeError exception 
uniform method (Random object) 
Uniform Resource Locators  [See URLs]
unit testing 
    large amounts of data 
unittest module 
    TestCase class 
universal newlines 
Unix
    binary/text file modes 
    dbm module 
    installing Python from source 
    mmap function 
    permission bits 
        copying 
    Python IDEs 
    running Python scripts 
    text editors with Python support 
Unix-to-Unix (UU) encoding 
unknown_charref method (sgmllib module) 
unknown_endtag method (sgmllib module) 
unknown_entityref method (sgmllib module) 
unknown_starttag method (sgmllib module) 
unlink function (os module) 
unpack function (struct module) 
Unpickler function (pickle/cPickle modules) 
unpost method (Menu object) 
unquote function
    urllib module 
    Utils module 
unquote_plus function (urllib module) 
unzip program 
up command (pdb module) 
update method
    dictionary object 
    Widget object 
update_idletasks method (Widget object) 
upper method (string object) 
uppercase attribute (string module) 
URL access 
    authentication 
    urllib module 
        FancyURLopener class (urllib module) 
    urllib2 module 
        OpenDirector class 
        Request class 
    urlparse module 
url argument (distutils setup function) 
URL file-like object
    close method 
    geturl method 
    info method 
    read method 
    readline method 
    readlines method 
urlcleanup function (urllib module) 
urlencode function (urllib module) 
urljoin function (urlparse module) 
urllib module  2nd 
    FancyURLopener class 
    quote function 
    quote_plus function 
    unquote function 
    unquote_plus function 
    urlcleanup function 
    urlencode function 
    urlopen function 
    urlretrieve function 
urllib2 module  2nd 
    build_opener function 
    install_opener function 
    OpenDirector class 
    OpenerDirector class, handler classes 
    Request class 
    urlopener function 
urlopen function
    urllib module 
    urllib2 module 
urlparse module  2nd 
    urljoin function 
    urlsplit function 
    urlunsplit function 
urlretrieve function (urllib module) 
URLs (Uniform Resource Locators)  2nd 
    access to network protocols  [See URL access]
    analyzing/synthesizing 
    outgoing 
    reading data from 
urlsplit function (urlparse module) 
urlunsplit function (urlparse module) 
use_rawinput attribute (cmd module) 
Usenet News  [See network news]
user customization 
user input, errors depending on 
user method (POP3 object) 
user module 
UserDict class (UserDict module) 
UserDict module
    data attribute 
    UserDict class 
UserList class (UserList module) 
UserList module
    data attribute 
    UserList class 
UserString class (UserString module) 
UserString module
    data attribute 
    UserString class 
UserWarning class 
UTC (Coordinated Universal Time) 
utc function (mx.DateTime module) 
utctime function (mx.DateTime module) 
Utils module (email package) 
    decode function 
    dump_address_pair function 
    encode function 
    formatdate function 
    getaddresses function 
    mktime_tz function 
    parseaddr function 
    parsedate function 
    parsedate_tz function 
    quote function 
    unquote function 
utime function (os module) 
UU (Unix-to-Unix) encoding 
uu module 
    decode function 
    encode function