Minimal refcycle example

gistfile1.txt

import gc
import objgraph

class Foo(object):

    def __init__(self):
        self._gen = None

    def __iter__(self):
        self._gen = self.gen()
        return self._gen

    def gen(self):
        try:
            big_list = [i for i in xrange(1000)]
            for i in big_list:
                yield i
        except:
            raise

def foo():
    count = 0

    while count < 10:
        count += 1
        print count
        f = Foo()
        it = iter(f)
        it.next()

if __name__ == "__main__":
    gc.collect()
    gc.collect()
    foo()
    gc.collect()
    gc.collect()
    objgraph.show_backrefs(objgraph.by_type('Foo'), max_depth=10, filename="results_with_try_except.png")