shell

Fix Python – how to check which version of nltk, scikit learn installed?

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In shell script I am checking whether this packages are installed or not, if not installed then install it. So withing shell script:
import nltk
echo nltk.__version__

but it stops shell script at import line
in linux terminal tried to see in this manner:
which nltk

which gives nothing thought it is installed.
Is there any other way to verify thi….

Fix Python – Call Python script from bash with argument

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I know that I can run a python script from my bash script using the following:
python python_script.py

But what about if I wanted to pass a variable / argument to my python script from my bash script. How can I do that?
Basically bash will work out a filename and then python will upload it, but I need to send the filename from bash to python when….

Fix Python – How do I add tab completion to the Python shell?

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When starting a django application using python manage.py shell, I get an InteractiveConsole shell – I can use tab completion, etc.
Python 2.5.1 (r251:54863, Apr 15 2008, 22:57:26)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type “help”, “copyright”, “credits” or “license” for more information.
(InteractiveConsole)

When just starting a python ….

Fix Python – How to escape os.system() calls?

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When using os.system() it’s often necessary to escape filenames and other arguments passed as parameters to commands. How can I do this? Preferably something that would work on multiple operating systems/shells but in particular for bash.
I’m currently doing the following, but am sure there must be a library function for this, or at least a more….

Fix Python – How do I activate a virtualenv inside PyCharm’s terminal?

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I’ve set up PyCharm, created my virtualenv (either through the virtual env command, or directly in PyCharm) and activated that environment as my Interpreter. Everything is working just fine.
However, if I open a terminal using “Tools, Open Terminal”, the shell prompt supplied is not using the virtual env; I still have to use source ~/envs/someenv/….

Fix Python – How to repeat last command in python interpreter shell?

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How do I repeat the last command? The usual keys: Up, Ctrl+Up, Alt-p don’t work. They produce nonsensical characters.
(ve)[kakarukeys@localhost ve]$ python
Python 2.6.6 (r266:84292, Nov 15 2010, 21:48:32)
[GCC 4.4.4 20100630 (Red Hat 4.4.4-10)] on linux2
Type “help”, “copyright”, “credits” or “license” for more information.
>>> print “hello world….

Fix Python – Seeing escape characters when pressing the arrow keys in python shell

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In shells like the interactive python shell, you can usually use the arrow keys to move around in the current line or get previous commands (with arrow-up) etc.
But after I ssh into another machine and start python there, I get sessions like:
>>> import os
>>> ^[[A

where the last character comes from arrow-up. Or, using arrow-left:
>>> impor….

Fix Python – live output from subprocess command

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I’m using a python script as a driver for a hydrodynamics code. When it comes time to run the simulation, I use subprocess.Popen to run the code, collect the output from stdout and stderr into a subprocess.PIPE — then I can print (and save to a log-file) the output information, and check for any errors. The problem is, I have no idea how the c….