Pythoners,
I'm having trouble understanding the behavior of global variables in a
code I'm writing. I have a file, test.py, with the following contents
foo = []
def goo():
global foo
foo = []
foo.append(2)
def moo():
print foo
In an ipython session, I see the following:
In [1]: from test import *
In [2]: foo
Out[2]: []
In [3]: goo()
In [4]: foo
Out[4]: []
In [5]: moo()
[2]
I don't understand this behavior. I assumed that foo as defined in
test.py is a global object, but that doesn't seem to be the case.
Obviously, there's some sort of namespace thing going on here that I
don't get. The ipython session seems to be dealing with one copy of foo
while goo() and moo() are using an entirely different copy.
If I take out the line 'foo = []' in goo(), everything behaves exactly
as I expect, that is, in ipython, when I type goo() followed by foo I
get [2].
Can anyone shed some light on this behavior?
Cheers,
A.J.
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