Package Layout
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The Python X Library is distrubuted as a Python package, named Xlib.  It contains a number of modules providing the main library interface:

display

     Contains the Display class, providing the X connection and access to all other X objects and operations.

error

     Contains all Xlib exception classes.

threaded

     Imported to set up the library to be thread-safe.

rdb

     Contains ResourceDB, an X resource database class, and related code.

X

     Contains symbolic names for all basic X protocol constants.

Xutil

     Contains additional constants for mainly the ICCCM standard.

XK

     Contains symbolic names for all X keysyms.

Xatom

     Contains symbolic names for all standard X atoms.

Xcursorfont

     Contains symbolic names for all standard X fonts.

There is also a number of subpackages, but they will mainly be of interest to developers of the Xlib itself:

protocol

     The low-level protocol implementation.  Contains definitions of all X request, responses, events and errors, in addition to the core network code.  The high-level object oriented interface provided by Xlib.display is merely a wrapper around this package.

support

     Miscellaneous supporting code for handling threads and operating system-specific features.

xobject

     Contains classes for all X objects, which are returned by various display operations.

ext

     Contains various X protocol extensions.  Extensions supported by the server are loaded automatically at the display connection.