detail

• map python built-in functions

When I use the map functions, there is a noteworthy detail.

data = ['1','2','3','4']
def fx(i):
    print(i)

map(fx,data)

Originally I thought it would output a '1', '2', '3', '4', but the results did not.

But when I joined the list, in front of the map function List (map (fx, the Data)) , then output the results.

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