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66 lines
2.6 KiB
ReStructuredText
66 lines
2.6 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 to be
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passed to :func:`~readline.set_completer` in the :mod:`readline` module.
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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:`~Completer.complete` method is set as the
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:ref:`readline completer <readline-completion>`. The method provides
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completion of valid Python :ref:`identifiers and keywords <identifiers>`.
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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
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:ref:`interactive mode <tut-interactive>`. Unless Python is run with the
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:option:`-S` option, the module is automatically imported and configured
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(see :ref:`rlcompleter-config`).
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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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.. class:: Completer
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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 next possible completion for *text*.
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When called by the :mod:`readline` module, this method is called
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successively with ``state == 0, 1, 2, ...`` until the method returns
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``None``.
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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:`~object.__getattr__`) up to the last part, and find matches for the
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rest via the :func:`dir` function. Any exception raised during the
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evaluation of the expression is caught, silenced and :const:`None` is
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returned.
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