Can someone please explain what happens to the map object? Why is the second list empty?
res = map(lambda x: 1 + x, range(1,5))
print (list(res))
print (list(res))
Result:
[2, 3, 4, 5]
[]
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2`res` is a generator that you're exhausting first time you're making it a list. – Filip Młynarski Feb 20 '20 at 14:20
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1The second line exhausts the `map` object. Or in other words: it has finished doing its job. – Klaus D. Feb 20 '20 at 14:23