Let's say I'm calling a python file from this directory:
 $ pwd
 $ my_dir1/path1/
 $ python mydir2/path2/my_code.py
Note that my_code.py is stored at another directory.
What I want to do is in my_code.py determine where it is called.
Namely I want it to display my_dir1/path1/. 
What code should I put in my_code.py.
 
    