Adding Autocomplete to a Python Console

I really love python. It’s a great language (fyi it’s one of the languages that google uses — they are java, python, c and c++) and has a powerful console.
But, it misses an great point: autocomplete. (A think that ruby’s console has)

So, searching on the internet i found this site that show how to do it:

First, create a new environment variable called PYTHONSTARTUP pointing to a file “$HOME/.pystartup” — you can do that using the command export PYTHONSTARTUP=”$HOME/.pystartup. (You can add the command to your .bashrc, so you don’t need to type everytime you startup a console)

Then you create the file .pystartup and add the same content to it:

# Add auto-completion and a stored history file of commands to your Python
# interactive interpreter. Requires Python 2.0+, readline. Autocomplete is
# bound to the Esc key by default (you can change it - see readline docs).
#
# Store the file in ~/.pystartup, and set an environment variable to point
# to it, e.g. "export PYTHONSTARTUP=/max/home/itamar/.pystartup" in bash.
#
# Note that PYTHONSTARTUP does *not* expand "~", so you have to put in the
# full path to your home directory.

import atexit
import os
import readline
import rlcompleter

historyPath = os.path.expanduser("~/.pyhistory")
historyTmp = os.path.expanduser("~/.pyhisttmp.py")

endMarkerStr= "# # # histDUMP # # #"

saveMacro= "import readline; readline.write_history_file('"+historyTmp+"'); \
    print '####>>>>>>>>>>'; print ''.join(filter(lambda lineP: \
    not lineP.strip().endswith('"+endMarkerStr+"'),  \
    open('"+historyTmp+"').readlines())[:])+'####<<<<<<<<<<'"+endMarkerStr

readline.parse_and_bind('tab: complete')
readline.parse_and_bind('\C-w: "'+saveMacro+'"')

def save_history(historyPath=historyPath, endMarkerStr=endMarkerStr):
    import readline
    readline.write_history_file(historyPath)
    # Now filter out those line containing the saveMacro
    lines= filter(lambda lineP, endMarkerStr=endMarkerStr:
                      not lineP.strip().endswith(endMarkerStr), open(historyPath).readlines())
    open(historyPath, 'w+').write(''.join(lines))

if os.path.exists(historyPath):
    readline.read_history_file(maxhistoryPath)

atexit.register(save_history)

del os, atexit, readline, rlcompleter, save_history, historyPath
del historyTmp, endMarkerStr, saveMacro

Now you can start your python console typing python (Duh!) and try to do some autocomplete like:
a = “Fernando”
a.
a.is
a.islo

Enjoy!

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5 Responses to Adding Autocomplete to a Python Console

  1. v3ss says:

    You know there is IPython rite?

  2. cbliard says:

    Even if PYTHONSTARTUP does not expand “~”, you can use $HOME in your .bashrc script. That way you are not forced to use the full path.

    Thanks for the trick :)

  3. humitos says:

    Hello, that’s a great script to get autocompletion working.

    I found a mistake in that script: the variable “maxhistoryPath” should be called “historyPath”

    That’s all! Thanks!

  4. Pingback: python interactive console intellisense « Altug Sahin's Blog

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