Python编程：list列表的几个高阶函数map、filter、reduce

$ python --version
Python 3.7.0

# -*- coding: utf-8 -*-
lst = [1, 2, 3]
# map
lst1 = list(map(lambda x: x * 2, lst))
print(lst1)
# [2, 4, 6]
# 列表生成式
lst2 = [x * 2 for x in lst]
print(lst2)
# [2, 4, 6]

# -*- coding: utf-8 -*-
lst = [1, 2, 3, 4, 5, 6]
# filter
lst1 = list(filter(lambda x: x > 3, lst))
print(lst1)
# [4, 5, 6]
lst2 = [x for x in lst if x > 3]
print(lst2)
# [4, 5, 6]

# -*- coding: utf-8 -*-
from functools import reduce
lst = [1, 2, 3, 4, 5]
# reduce
total = reduce(lambda x, y: x + y, lst, 0)
print(total)
# 15

# -*- coding: utf-8 -*-
lst = [1, 2, 3, 4, 5]
total = 0
for x in lst:
    total += x
print(total)
# 15