How do I get the path of the Python script I am running in?

Use this to get the path of the current file. It will resolve any symlinks in the path.

import os

file_path = os.path.realpath(__file__)

This works fine on my mac. It won't work from the Python interpreter (you need to be executing a Python file).

import os
print os.path.abspath(__file__)

7.2 of Dive Into Python: Finding the Path.

import sys, os

print('sys.argv[0] =', sys.argv[0])             
pathname = os.path.dirname(sys.argv[0])        
print('path =', pathname)
print('full path =', os.path.abspath(pathname)) 

If you have even the relative pathname (in this case it appears to be ./) you can open files relative to your script file(s). I use Perl, but the same general solution can apply: I split the directory into an array of folders, then pop off the last element (the script), then push (or for you, append) on whatever I want, and then join them together again, and BAM! I have a working pathname that points to exactly where I expect it to point, relative or absolute.

Of course, there are better solutions, as posted. I just kind of like mine.