6.8. "rlcompleter" --- Completion function for GNU readline
***********************************************************

**Source code:** Lib/rlcompleter.py

======================================================================

The "rlcompleter" module defines a completion function suitable for
the "readline" module by completing valid Python identifiers and
keywords.

When this module is imported on a Unix platform with the "readline"
module available, an instance of the "Completer" class is
automatically created and its "complete()" method is set as the
"readline" completer.

示例:

   >>> import rlcompleter
   >>> import readline
   >>> readline.parse_and_bind("tab: complete")
   >>> readline. <TAB PRESSED>
   readline.__doc__          readline.get_line_buffer(  readline.read_init_file(
   readline.__file__         readline.insert_text(      readline.set_completer(
   readline.__name__         readline.parse_and_bind(
   >>> readline.

The "rlcompleter" module is designed for use with Python's interactive
mode.  Unless Python is run with the "-S" option, the module is
automatically imported and configured (see Readline configuration).

On platforms without "readline", the "Completer" class defined by this
module can still be used for custom purposes.


6.8.1. Completer Objects
========================

Completer objects have the following method:

Completer.complete(text, state)

   Return the *state*th completion for *text*.

   If called for *text* that doesn't include a period character
   ("'.'"), it will complete from names currently defined in
   "__main__", "builtins" and keywords (as defined by the "keyword"
   module).

   If called for a dotted name, it will try to evaluate anything
   without obvious side-effects (functions will not be evaluated, but
   it can generate calls to "__getattr__()") up to the last part, and
   find matches for the rest via the "dir()" function.  Any exception
   raised during the evaluation of the expression is caught, silenced
   and "None" is returned.
