Subprocess changing directory

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I want to execute a script inside a subdirectory/superdirectory (I need to be inside this sub/super-directory first). I can"t get subprocess to enter my subdirectory:

[email protected]:~/Projekty/tests/ve$ python
Python 2.7.4 (default, Sep 26 2013, 03:20:26) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> import os
>>> os.getcwd()
"/home/tducin/Projekty/tests/ve"
>>> subprocess.call(["cd .."])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/subprocess.py", line 524, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/subprocess.py", line 711, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1308, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Python throws OSError and I don"t know why. It doesn"t matter whether I try to go into an existing subdir or go one directory up (as above) - I always end up with the same error.

Subprocess changing directory cwd: Questions

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