applies a function to all the items in an input_list
Blueprint
map(function, list_of_inputs)
Most of the times we want to pass all the list elements to a function one-by-one and then collect the output. For instance:
items = [1, 2, 3, 4, 5]
squared = []
for i in items:
squared.append(i**2)
Map allows us to implement this in a much simpler and nicer way. Here you go:
items = [1, 2, 3, 4, 5] squared = list(map(lambda x: x**2, items))
原文：http://www.cnblogs.com/KennyRom/p/6607289.html