Python label for _ 用法

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Python label for _ 用法

Python label for _ 用法


>>> label_data = [iter([3,4]),iter([4,9]), iter([7,3]),iter([9,1])]
>>> label_data = [iter([3,4]),iter([4,9]), iter([7,3]),iter([9,1]),iter([8,5])]
>>> labels = [label for _, label in label_data]
>>> print labels
[4, 9, 3, 1, 5]
>>> label_data = [iter([12,4]),iter([4,9]), iter([7,3]),iter([9,1]),iter([8,5])]
>>> labels = [label for _, label in label_data]
>>> print labels
[4, 9, 3, 1, 5]
>>> label_data = [iter([12,4]),iter([31,9]), iter([7,3]),iter([9,1]),iter([8,5])]
>>> labels = [label for _, label in label_data]
>>> print labels
[4, 9, 3, 1, 5]


是取 iter 右值