filesystems - finding out absolute path to a file from python -

If I have a file that stays in some directory, then how can I know from test.py Is it in the directory? Os.path.curdir will provide the current directory but not the directory where the file resides. If I invite test.py from some directory "foo", os.curdir will return to foo, but not the path of test.py.

Thank you.

How to obtain a directory of existing files:

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