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annotate Doc/tutorial/interactive.rst @ 86127:a3d09c19bb93

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merge with 3.3
author Georg Brandl <georg@python.org>
date Sun, 06 Oct 2013 19:24:00 +0200
parents d5ef330bac50
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1 .. _tut-interacting:
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3 **************************************************
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4 Interactive Input Editing and History Substitution
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5 **************************************************
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6
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7 Some versions of the Python interpreter support editing of the current input
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8 line and history substitution, similar to facilities found in the Korn shell and
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9 the GNU Bash shell. This is implemented using the `GNU Readline`_ library,
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10 which supports various styles of editing. This library has its own
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11 documentation which we won't duplicate here.
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14 .. _tut-keybindings:
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16 Tab Completion and History Editing
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17 ==================================
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18
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19 Completion of variable and module names is
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20 :ref:`automatically enabled <rlcompleter-config>` at interpreter startup so
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21 that the :kbd:`Tab` key invokes the completion function; it looks at
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22 Python statement names, the current local variables, and the available
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23 module names. For dotted expressions such as ``string.a``, it will evaluate
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24 the expression up to the final ``'.'`` and then suggest completions from
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25 the attributes of the resulting object. Note that this may execute
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26 application-defined code if an object with a :meth:`__getattr__` method
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27 is part of the expression. The default configuration also saves your
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28 history into a file named :file:`.python_history` in your user directory.
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29 The history will be available again during the next interactive interpreter
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30 session.
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33 .. _tut-commentary:
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35 Alternatives to the Interactive Interpreter
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36 ===========================================
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38 This facility is an enormous step forward compared to earlier versions of the
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39 interpreter; however, some wishes are left: It would be nice if the proper
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40 indentation were suggested on continuation lines (the parser knows if an indent
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41 token is required next). The completion mechanism might use the interpreter's
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42 symbol table. A command to check (or even suggest) matching parentheses,
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43 quotes, etc., would also be useful.
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45 One alternative enhanced interactive interpreter that has been around for quite
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46 some time is IPython_, which features tab completion, object exploration and
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47 advanced history management. It can also be thoroughly customized and embedded
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48 into other applications. Another similar enhanced interactive environment is
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49 bpython_.
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52 .. _GNU Readline: http://tiswww.case.edu/php/chet/readline/rltop.html
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53 .. _IPython: http://ipython.scipy.org/
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54 .. _bpython: http://www.bpython-interpreter.org/