Python内置函数zip map filter的使用详解

L1=[1,2,3,4]
L2=[5,6,7,8]
L3=zip(L1,L2)
print(L3,type(L3))

<zip object at 0x7feb81b17f08> <class 'zip'>

list(L3)

[(1, 5), (2, 6), (3, 7), (4, 8)]

for (x,y) in zip(L1,L2):
  print(x,y,'--',x+y)

1 5 -- 6
2 6 -- 8
3 7 -- 10
4 8 -- 12

keys=['spam','eggs','toast']
val=[1,3,5]

D3=dict(zip(keys,val))
print(D3)

{'spam': 1, 'eggs': 3, 'toast': 5}

map_obj=map(abs,(-10,0,9))
print(list(map_obj))

[10, 0, 9]

filter_obj=filter(lambda x:x<3 ,L1)
print(list(filter_obj))

[1, 2]