Michael Abbott a écrit : > It seems to be an invariant of Python (insofar as Python has invariants) > that a module is executed at most once in a Python session. I have a > rather bizzare example that breaks this invariant: can anyone enlighten > me as to what is going on? > > --- test.py --- > import imptest > execfile('subtest.py', dict(__name__ = 'subtest.py')) > --- imptest.py --- > print 'Imptest imported' > --- subtest.py --- > import imptest > --- > > $ python test.py > Imptest imported > Imptest imported > $ > > Hmm. If the value __name__ is omitted from the dictionary, or if its > value doesn't match at least 'subtest.' then the message is printed only > once (for example, passing dict(__name__='subtest') produces one > "imported" message).
During module evaluation, __name__ is usually set to the name of the module *object*, not the name of the *file*. I suspect that it has something to do with your observation. -- http://mail.python.org/mailman/listinfo/python-list