To come back to the OPs question.
Variables can be assigned. Or they can be bound.
[C++ programmers will be familiar with the difference between
initialization and assignment]
List comprehensions are defined in terms of assignment to the local
variable rather than binding.
Hence the issue.
Below are two functions that simulate mapping (lambda x: x**i) where
the i's come from some given list
def binding_version(lst):
if not lst: return []
i = lst[0]
return [(lambda x: x ** i)] + binding_version(lst[1:])
def assign_version(lst):
ret = []
for i in lst:
ret.append(lambda x: x**i)
return ret
----------------------
>>> fs= binding_version([0,1,2])
>>> fs[0](2)
1
>>> fs[1](2)
2
>>> fs[2](2)
4
>>> fs= assign_version([0,1,2])
>>> fs[0](2)
4
>>> fs[1](2)
4
>>> fs[2](2)
4
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