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

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

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

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?

When starting a django application using python 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.

When just starting a python ….

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

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?

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?

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

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

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….