Python (zip, lambda, map, shallow copy, deepcopy)

Posted 2021-03-05 Steve Yu

Python (zip, lambda, map, shallow copy, deepcopy)

1.zip

数据进行绑定到一起

a = [1, 2, 3]
b = [4, 5, 6]
c = [7, 8, 9]
for k, v, v2 in zip(a, b, c):
    print(k, v, v2)

2.lambda, map

• lambda进行输入 ：输出简化
• map传入函数和可迭代对象可以进行依次进行映射执行

fun = lambda x, y, z: x + y + z
print(list(map(fun, a, b, c)))

3.deepcopy和shallowcopy

• 赋值传的是引用
• shallowcopy是一层拷贝
• deepcopy是深层拷贝

import copy

a = [1, 2, [1, 2]]

b = copy.deepcopy(a) # deep copy
c = copy.copy(a) # shallow copy

print(id(a) == id(b))
print(a == b)

print(id(a[2]) == id(b[2]))
print(a)
print(b)