filter, zip, map, reduce, all, any

# all 判断是否有布尔值有False的值
# any 判断是否有布尔值有True的值
lst = [1, 2, 3, '', 4, []]
print(all(lst))  # False
print(any(lst))  # True


#zip： 拉链方法
lst1 = [1,2,3,4]
lst2 = [5,6,7,8]
z = zip(lst1, lst2)  # 迭代器
print(list(z))  # [(1, 5), (2, 6), (3, 7), (4, 8)]

# filter(function or None, iterable): 过滤
def larger(x):
    return x>5

lst = [3,4,5,6,7] 
ret = filter(larger, lst)
print(list(ret))  # [6, 7]


# map(func,*iterables): 依次处理iterables里的每一个元素，并返回一个可迭代对象
def self_add_one(x):
    return x+1

lst = [3,4,5,6,7] 
ret = map(self_add_one,lst)
print(list(ret))  # [4, 5, 6, 7, 8]


# reduce, py3 reduce被移到了functools模块
# reduce(function, sequence[, intiial])： 将sequence里的所有元素通过function方法压缩成一个值，必返回
from functools import reduce
lst = [3,4,5,6,7] 
def my_add(x,y):
    return x+y

ret =  reduce(my_add, lst)
print(ret)  # 25


# sorted(iterable, key, reverse)
# iterable: 可迭代对象
# key: 按照提供的key排序
# reverse: 是否反转序列
lst1 = [8, 5, -6, 7] 
lst2 = lst1[:]
lst1.sort()
print(lst1) # [-6, 5, 7, 8]
ret = sorted(lst2, key=abs)
print(ret)  # [5, -6, 7, 8]