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restore accidentally removed EngineError...
restore accidentally removed EngineError in cleanup PR #3527, I removed one too many exception classes. I acked IPython to confirm that I didn't miss any more. closes #4100 should be backported to 1.1.

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show_refs.py
19 lines | 342 B | text/x-python | PythonLexer
"""Simple script to show reference holding behavior.
This is used by a companion test case.
"""
import gc
class C(object):
def __del__(self):
pass
#print 'deleting object...' # dbg
if __name__ == '__main__':
c = C()
c_refs = gc.get_referrers(c)
ref_ids = map(id,c_refs)
print 'c referrers:',map(type,c_refs)