Python - map与匿名函数lambda（ 快速操作序列 ）

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 map：根据给定的函数对序列做映射

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from collections import Counter

friends = [{"sex":"male","id":1},{"sex":"female","id":2},{"sex":"female","id":2}]

a = list(map(lambda x:x["sex"],friends[:]))
b = map(lambda x:x["sex"],friends[:])
c = map(lambda x:x[1],Counter(list(a)).items())
d = list(map(lambda x:x[1],Counter(a).items()))

print(type(a))
print(a)
print(type(b))
print(b)
print(type(c))
print(c)
print(type(d))
print(d)


count = len(a)
print(count)

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