Hey group,
I stumbled about something that I cannot quite explain while doing some
stupid naming of variables in my code, in particular using "collections"
as an identifier. However, what results is strange. I've created a
minimal example. Consider this:
import collections
class Test(object):
def __init__(self):
z = {
"y": collections.defaultdict(list),
}
for (_, collections) in z.items():
pass
Test()
In my opinion, this should run. However, this is what happens on Python
3.6.3 (default, Oct 3 2017, 21:45:48) [GCC 7.2.0] on linux):
Traceback (most recent call last):
File "x.py", line 11, in <module>
Test()
File "x.py", line 6, in __init__
"y": collections.defaultdict(list),
UnboundLocalError: local variable 'collections' referenced before assignment
Interestingly, when I remove the class:
import collections
z = {
"y": collections.defaultdict(list),
}
for (_, collections) in z.items():
pass
It works as expected (doesn't throw).
Have I found a bug in the interpreter or am I doing something incredibly
stupid? I honest cannot tell right now now.
Cheers,
Joe
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