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68 lines
2.4 KiB
ReStructuredText
68 lines
2.4 KiB
ReStructuredText
:mod:`rlcompleter` --- Completion function for GNU readline
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===========================================================
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.. module:: rlcompleter
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:synopsis: Python identifier completion, suitable for the GNU readline library.
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.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
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**Source code:** :source:`Lib/rlcompleter.py`
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--------------
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The :mod:`rlcompleter` module defines a completion function suitable for the
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:mod:`readline` module by completing valid Python identifiers and keywords.
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When this module is imported on a Unix platform with the :mod:`readline` module
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available, an instance of the :class:`Completer` class is automatically created
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and its :meth:`complete` method is set as the :mod:`readline` completer.
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Example::
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>>> import rlcompleter
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>>> import readline
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>>> readline.parse_and_bind("tab: complete")
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>>> readline. <TAB PRESSED>
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readline.__doc__ readline.get_line_buffer( readline.read_init_file(
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readline.__file__ readline.insert_text( readline.set_completer(
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readline.__name__ readline.parse_and_bind(
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>>> readline.
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The :mod:`rlcompleter` module is designed for use with Python's interactive
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mode. A user can add the following lines to his or her initialization file
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(identified by the :envvar:`PYTHONSTARTUP` environment variable) to get
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automatic :kbd:`Tab` completion::
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try:
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import readline
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except ImportError:
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print("Module readline not available.")
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else:
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import rlcompleter
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readline.parse_and_bind("tab: complete")
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On platforms without :mod:`readline`, the :class:`Completer` class defined by
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this module can still be used for custom purposes.
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.. _completer-objects:
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Completer Objects
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-----------------
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Completer objects have the following method:
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.. method:: Completer.complete(text, state)
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Return the *state*\ th completion for *text*.
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If called for *text* that doesn't include a period character (``'.'``), it will
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complete from names currently defined in :mod:`__main__`, :mod:`builtins` and
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keywords (as defined by the :mod:`keyword` module).
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If called for a dotted name, it will try to evaluate anything without obvious
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side-effects (functions will not be evaluated, but it can generate calls to
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:meth:`__getattr__`) up to the last part, and find matches for the rest via the
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:func:`dir` function. Any exception raised during the evaluation of the
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expression is caught, silenced and :const:`None` is returned.
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