Look for the for/else construct in python code

find_forelse.py

#!/usr/bin/env python

# Parses a .py file and look for for-else constructs
# Usage: find_forelse.py some_python_file.py

import sys
import ast

def check_file(filename):
    with open(filename, "r") as f:
        module = ast.parse(f.read(), filename, 'exec')
        for node in ast.walk(module):
            if isinstance(node, ast.For) and node.orelse:
                print "found for-else statement in %s:%d" % (filename, node.lineno)


if __name__ == '__main__':
    check_file(sys.argv[1])