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How do you check whether a file is a normal file or a directory using python?

As other answers have said, os.path.isdir() and os.path.isfile() are what you want. However, you need to keep in mind that these are not the only two cases. Use os.path.islink() for symlinks for instance. Furthermore, these all return False if the file does not exist, so you'll probably want to check with os.path.exists() as well.

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Python 3.4 introduced the pathlib module into the standard library, which provides an object oriented approach to handle filesystem paths. The relavant methods would be .is_file() and .is_dir():

In [1]: from pathlib import Path

In [2]: p = Path('/usr')

In [3]: p.is_file()
Out[3]: False

In [4]: p.is_dir()
Out[4]: True

In [5]: q = p / 'bin' / 'vim'

In [6]: q.is_file()
Out[6]: True

In [7]: q.is_dir()
Out[7]: False

Pathlib is also available on Python 2.7 via the pathlib2 module on PyPi.

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If you're just stepping through a set of directories you might be better just to try os.chdir and give an error/warning if it fails:

import os,sys
for DirName in sys.argv[1:]:
    SaveDir = os.getcwd()
        print "Changed to "+DirName
        # Do some stuff here in the directory
        sys.stderr.write("%s: WARNING: Cannot change to %s\n" % (sys.argv[0],DirName))
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