how to get a part of file path?

for example I have string:

test = "/var/tm开发者_如何学运维p/test.log" 

I want to get a path of this file.

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Use os.path.dirname():

>>> import os
>>> os.path.dirname('/var/tmp/test.log')
'/var/tmp'

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 >>> import os
 >>> os.path.dirname("/var/tmp/test.log")
 '/var/tmp'

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if you want to get absolute path, try this

C:>python Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information.

>>> import os.path
>>> test = '.'
>>> os.path.dirname(os.path.abspath(test))
'C:\\'

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Which part are you interested in? The os.path module has a lot of useful functions. If that fails, a .split("/") would do the trick.