On 7/15/2009 10:55 AM Rodrigue said...
I came accross a strange behaviour in python today. Here is a simple
example to describe my situation:
MY_GLOBAL = ''
<snip>
def e_raise():
if not MY_GLOBAL:
MY_GLOBAL = 'bla'
<snip>
Traceback (most recent call last):
File "glo.py", line 49, in <module>
e_raise()
File "glo.py", line 39, in e_raise
if not MY_GLOBAL:
UnboundLocalError: local variable 'MY_GLOBAL' referenced before
assignment
the def prepares the function for subsequent use. At this prep time,
MY_GLOBAL, by virtue of being assigned to later in the function, and the
absence of a global statement, is identified as a local variable.
Later, at execution time, testing MY_GLOBAL fails as it's not yet been
assigned to.
HTH,
Emile
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