Hello,
I've think I've found a bug in Cython (or is this just a funny feature?).
The error occurs when the variable name used as source for the iteration is
also used as a value.
Given the files test1.pyx (cython) and test2.py (python):
test1.pyx:
def test():
x = range(10)
return [x for x in x]
test2.py:
def test():
x = range(10)
return [x for x in x]
The results in running them are:
>>> import test1, test2
>>> test1.test()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "test1.pyx", line 4, in test1.test
(/Users/leandro/.pyxbld/temp.macosx-10.6-intel-3.4/pyrex/test1.c:666)
return [x for x in x]
UnboundLocalError: local variable 'x' referenced before assignment
>>> test2.test()
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>
A regular for loop will behave correctly:
code:
def test():
x = range(10)
ret = []
for x in x:
ret.append(x)
return ret
result:
>>> import test1, test2
>>> test1.test()
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> test2.test()
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>
Cheers, Leandro
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