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How do you properly determine the current script directory?

Asked 2010-09-15T14:34:57.257
413

I would like to see what is the best way to determine the current script directory in Python.

I discovered that, due to the many ways of calling Python code, it is hard to find a good solution.

Here are some problems:

  • __file__ is not defined if the script is executed with exec, execfile
  • __module__ is defined only in modules

Use cases:

  • ./myfile.py
  • python myfile.py
  • ./somedir/myfile.py
  • python somedir/myfile.py
  • execfile('myfile.py') (from another script, that can be located in another directory and that can have another current directory.

I know that there is no perfect solution, but I'm looking for the best approach that solves most of the cases.

The most used approach is os.path.dirname(os.path.abspath(__file__)) but this really doesn't work if you execute the script from another one with exec().

Warning

Any solution that uses current directory will fail, this can be different based on the way the script is called or it can be changed inside the running script.

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2 Answers

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os.path.dirname(os.path.abspath(__file__))

is indeed the best you're going to get.

It's unusual to be executing a script with exec/execfile; normally you should be using the module infrastructure to load scripts. If you must use these methods, I suggest setting __file__ in the globals you pass to the script so it can read that filename.

There's no other way to get the filename in execed code: as you note, the CWD may be in a completely different place.

answered 2010-09-15T15:01:21.187
8

Would

import os
cwd = os.getcwd()

do what you want? I'm not sure what exactly you mean by the "current script directory". What would the expected output be for the use cases you gave?

answered 2010-09-15T14:59:29.167

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