Christopher King added the comment:
This is a crazy and unexpected behavior. (Moreover, the fact that Python has
dynamic scope *only if you forget to initialize a variable* is even more crazy
and unexpected.) To provide unsurprising behavior (i.e. behavior compatible
with that of a list comprehension) the generator above should "unwrap" (i.e.
reduce) to:
def g1(x):
for y in 'c':
yield x+y
l = []
for x in 'ab':
l.append(g1(x))
print l
print map(list, l)
i.e. the variables referenced by, but not initialized by, the innermost
generator should add extra parameters to the generated generator function.
----------
nosy: +Christopher.King
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Python tracker <[email protected]>
<http://bugs.python.org/issue7423>
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