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Which in python

Saturday, June 2, 2007 ★ 17:12 ★ Category Programming

If you want the functionality of which in a Python program, i.e. you want to look up the file system path for a given executable, you may use this simple function:

def which(e): return ([os.path.join(p, e) for p in os.environ['PATH'].split(os.pathsep) if os.path.exists(os.path.join(p, e))] + [None])[0]

The return value is the full path or None if the executable was not found. Easy enough!