author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. _tut-interacting: |
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************************************************** |
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Interactive Input Editing and History Substitution |
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************************************************** |
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Some versions of the Python interpreter support editing of the current input |
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line and history substitution, similar to facilities found in the Korn shell and |
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the GNU Bash shell. This is implemented using the *GNU Readline* library, which |
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supports Emacs-style and vi-style editing. This library has its own |
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documentation which I won't duplicate here; however, the basics are easily |
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explained. The interactive editing and history described here are optionally |
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available in the Unix and Cygwin versions of the interpreter. |
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This chapter does *not* document the editing facilities of Mark Hammond's |
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PythonWin package or the Tk-based environment, IDLE, distributed with Python. |
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The command line history recall which operates within DOS boxes on NT and some |
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other DOS and Windows flavors is yet another beast. |
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.. _tut-lineediting: |
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Line Editing |
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============ |
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If supported, input line editing is active whenever the interpreter prints a |
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primary or secondary prompt. The current line can be edited using the |
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conventional Emacs control characters. The most important of these are: |
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:kbd:`C-A` (Control-A) moves the cursor to the beginning of the line, :kbd:`C-E` |
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to the end, :kbd:`C-B` moves it one position to the left, :kbd:`C-F` to the |
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right. Backspace erases the character to the left of the cursor, :kbd:`C-D` the |
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character to its right. :kbd:`C-K` kills (erases) the rest of the line to the |
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right of the cursor, :kbd:`C-Y` yanks back the last killed string. |
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:kbd:`C-underscore` undoes the last change you made; it can be repeated for |
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cumulative effect. |
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.. _tut-history: |
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History Substitution |
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==================== |
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History substitution works as follows. All non-empty input lines issued are |
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saved in a history buffer, and when a new prompt is given you are positioned on |
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a new line at the bottom of this buffer. :kbd:`C-P` moves one line up (back) in |
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the history buffer, :kbd:`C-N` moves one down. Any line in the history buffer |
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can be edited; an asterisk appears in front of the prompt to mark a line as |
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modified. Pressing the :kbd:`Return` key passes the current line to the |
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interpreter. :kbd:`C-R` starts an incremental reverse search; :kbd:`C-S` starts |
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a forward search. |
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.. _tut-keybindings: |
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Key Bindings |
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============ |
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The key bindings and some other parameters of the Readline library can be |
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customized by placing commands in an initialization file called |
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:file:`~/.inputrc`. Key bindings have the form :: |
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key-name: function-name |
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or :: |
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"string": function-name |
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and options can be set with :: |
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set option-name value |
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For example:: |
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# I prefer vi-style editing: |
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set editing-mode vi |
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# Edit using a single line: |
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set horizontal-scroll-mode On |
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# Rebind some keys: |
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Meta-h: backward-kill-word |
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"\C-u": universal-argument |
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"\C-x\C-r": re-read-init-file |
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Note that the default binding for :kbd:`Tab` in Python is to insert a :kbd:`Tab` |
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character instead of Readline's default filename completion function. If you |
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insist, you can override this by putting :: |
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Tab: complete |
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in your :file:`~/.inputrc`. (Of course, this makes it harder to type indented |
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continuation lines if you're accustomed to using :kbd:`Tab` for that purpose.) |
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.. index:: |
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module: rlcompleter |
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module: readline |
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Automatic completion of variable and module names is optionally available. To |
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enable it in the interpreter's interactive mode, add the following to your |
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startup file: [#]_ :: |
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import rlcompleter, readline |
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readline.parse_and_bind('tab: complete') |
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This binds the :kbd:`Tab` key to the completion function, so hitting the |
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:kbd:`Tab` key twice suggests completions; it looks at Python statement names, |
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the current local variables, and the available module names. For dotted |
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expressions such as ``string.a``, it will evaluate the expression up to the |
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final ``'.'`` and then suggest completions from the attributes of the resulting |
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object. Note that this may execute application-defined code if an object with a |
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:meth:`__getattr__` method is part of the expression. |
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A more capable startup file might look like this example. Note that this |
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deletes the names it creates once they are no longer needed; this is done since |
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the startup file is executed in the same namespace as the interactive commands, |
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and removing the names avoids creating side effects in the interactive |
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environment. You may find it convenient to keep some of the imported modules, |
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such as :mod:`os`, which turn out to be needed in most sessions with the |
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interpreter. :: |
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# Add auto-completion and a stored history file of commands to your Python |
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# interactive interpreter. Requires Python 2.0+, readline. Autocomplete is |
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# bound to the Esc key by default (you can change it - see readline docs). |
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# |
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# Store the file in ~/.pystartup, and set an environment variable to point |
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# to it: "export PYTHONSTARTUP=/home/user/.pystartup" in bash. |
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# |
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# Note that PYTHONSTARTUP does *not* expand "~", so you have to put in the |
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# full path to your home directory. |
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import atexit |
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import os |
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import readline |
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import rlcompleter |
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historyPath = os.path.expanduser("~/.pyhistory") |
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def save_history(historyPath=historyPath): |
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import readline |
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readline.write_history_file(historyPath) |
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if os.path.exists(historyPath): |
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readline.read_history_file(historyPath) |
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atexit.register(save_history) |
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del os, atexit, readline, rlcompleter, save_history, historyPath |
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.. _tut-commentary: |
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Commentary |
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========== |
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This facility is an enormous step forward compared to earlier versions of the |
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interpreter; however, some wishes are left: It would be nice if the proper |
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indentation were suggested on continuation lines (the parser knows if an indent |
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token is required next). The completion mechanism might use the interpreter's |
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symbol table. A command to check (or even suggest) matching parentheses, |
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quotes, etc., would also be useful. |
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.. rubric:: Footnotes |
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.. [#] Python will execute the contents of a file identified by the |
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:envvar:`PYTHONSTARTUP` environment variable when you start an interactive |
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interpreter. |
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167 |