gistfile1.py

def report_memory_leaked(f):
       """ Counts objects allocated in memory before and after the
           decorated function and reports the results.  If you decorate
           a function like
           @report_memory_leaked
           def myfunc():
              pass # do stuff

           It will report objects by type that were leaked or created.
       """
       from collections import defaultdict
       from gc import get_objects
       import logging

       def obj_counting_wrapper(*args, **kwargs):

           before=defaultdict(int)
           for i in get_objects():before[type(i)]+=1

           retval = f(*args, **kwargs)

           after=defaultdict(int)
           for i in get_objects():after[type(i)]+=1

           leaked_or_returned = [(k,after[k]-before[k]) for k in after if after[k]-before[k]]
           if leaked_or_returned:
               logging.debug('Leaked or returned:\n%r' % leaked_or_returned)

           return retval
       return obj_counting_wrapper