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  u'<?xml' (XML declaration) 
		   UDP (User Datagram Protocol)     passing messages with 
		       reliability of 
		       using to detect inactive computers on a network 
		   uiToolkit 
		   unbounded iterators, wrapping to restrict output 
		   undefined variables, testing for 
		   underscore (_) 
		   unichr 
		   Unicode 
		       characters, printing to standard output 
		       plain strings, converting to 
		       Unicode strings 
		  2nd 
		  3rd 
		       XML, autodetecting encoding in 
		       XML, default encoding in 
		   unique 
		   Unix     algorithms, measuring efficiency 
		       commands, capturing output and error streams from 
		       crossplatform debugging and 
		       debugging dynamically loaded C extensions 
		       measuring disk usage for 
		       network interface, checking status 
		   UNIX Network Programming, Volume 1\: Networking APIs - Sockets and XTI, Second Edition 
		   unpack (Perl) contrasted with struct.unpack (Python) 
		   unpacking 
		   update 
		   upper (string object method) 
		   uppercase, conversion to lowercase 
		   upperOpen 
		   urllib 
		   urllib and urllib2 modules 
		   urlopen 
		   user feedback during data entry, giving via Qt 
		   user interfaces 
		       avoiding lambda in writing callback functions 
		       building GTK GUIs interactively 
		       building toolkit-independent GUIs 
		       CLIs 
		       creating color scales 
		       creating dialog boxes with Tkinter 
		       creating menus with Tkinter 
		       embedding GIFs inline using Tkinter 
		       giving the user feedback during data entry with Qt 
		       GUIs 
		       Publish/Subscribe broadcasting to loosen coupling between GUIs and business logic systems 
		       supporting multiple values per row in a Tkinter listbox 
		       Tkinter 
		       wxPython Notebook with panels 
		   using list comprehensions instead of map and filter 
		   UTF-16 encoding 
		   UTF-8 
		  2nd 
		  
 
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