Steven D'Aprano wrote:
Given this module:
#funny.py
import sys
print "Before:"
print " __name__ =", __name__
print " sys.modules[__name__] =", sys.modules[__name__]
sys.modules[__name__] = 123
print "After:"
print " __name__ =", __name__
print " sys =", sys
when I run it I get these results:
[st...@sylar python]$ python2.6 funny.py
Before:
__name__ = __main__
sys.modules[__name__] = <module '__main__' from 'funny.py'>
After:
__name__ = None
sys = None
I'm completely perplexed by this behaviour. sys.modules() seems to be a
regular dict, at least according to type(), and yet assigning to an item
of it seems to have unexpected, and rather weird, side-effects.
What am I missing?
Maybe when you assign 123 to sys.modules[__name__], you've removed the
last reference on <module '__main__' from 'funny.py'> and it is
garbaged. You are then loosing all your initial namespace.
try this one:
#funny.py
import sys
print "Before:"
print " __name__ =", __name__
print " sys.modules[__name__] =", sys.modules[__name__]
foo = sys.modules[__name__] # backup ref for the garbage collector
sys.modules[__name__] = 123
print "After:"
print " __name__ =", __name__
print " sys =", sys
Jean-Michel
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