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Interpreter: Python 3.1.2
Sample:
===== first.py =====
import sys
import second 
if 'second' in sys.modules:
 print ('in sys modules')
 del sys.modules['second']
del second
===== second.py =====
class A:
 def __init__(self):
 print('created')
 def __del__(self):
 print('destroyed')
a = A()
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Result: 'destroyed' isn't printed
With Python 2.6.5 it worked fine