import sys
 
class Foo (object):
 
    def __enter__ (self):
        print("Enter")
        return 1
 
    def __exit__ (self, exit, value, exc):
        print("Exit")
 
mgr = Foo()
exit = Foo.__exit__
value = Foo.__enter__(mgr)
exc = True
try:
    try:
        foo = value
        print(foo)
    except:
        exc = False
        if not exit(mgr, *sys.exc_info()):
            raise
finally:
    if exc:
        exit(mgr, None, None, None)

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