I'm currently investigating a problem that can hit you in TurboGears
when Kid template modules are reloaded in the background, because in
certain situations, global variables suddenly are set to None values.
I tracked it down to the following behavior of Python. Assume you have a
module hello.py like that:
---- hello. py ----
greeting = 'Hello!'
def print_hello():
print greeting
-------------------
Now run the following code:
from hello import print_hello
print_hello()
import sys
del sys.modules['hello'] # delete module
import hello # recreate module
print_hello()
The second print_hello() prints "None" instead of "Hello!". Why is that?
I had expected that it either prints an error or print "Hello!" as well.
Is this intended behavior of Python?
-- Christoph
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