Get location of the .py source file

In Python +3.4 use of pathlib is more handy:

from pathlib import Path

source_path = Path(__file__).resolve()
source_dir = source_path.parent

# in /a/b/c/d/e/file.py
import os
os.path.dirname(os.path.abspath(__file__)) # /a/b/c/d/e