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hrchu/test.py

Created November 25, 2019 06:08
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Why map/filter is weaker than list comprehension or for loop iterating?
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test.py
alist = [[1,1],[1,1]]
assert([1, 1] == [x for x, y in alist]) # OK
for x, y in alist: # OK
assert x == 1
assert([1, 1] == list(map(lambda x, y: x, alist))) # TypeError: <lambda>() missing 1 required positional argument: 'y'
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hrchu commented Nov 25, 2019

Think lambda as general Python function. You need to do "*" in argument.

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