函数扩展

1.拆包

def func():
    return 1,2,3,4

result = func()
print(result)

n1,n2,n3,n4 = func() #拆包

print(n1)
print(n2)
print(n3)
print(n4)

2.浅拷贝

import copy

li = [1,1,2,3,4,5,6,7,8,9, ["s","a","b","c"] ]
l3 =  copy.copy(li) #浅拷贝
#print(l3[-1])
l3[-1].append("d")
l3.append("11111")

print(li)
print(l3)

print(id(li))
print(id(l3))

3.深拷贝

import copy

li = [1,1,2,3,4,5,6,7,8,9, ["s","a","b","c"] ]

l3 = copy.deepcopy(li) #深拷贝
#print(l3[-1])
l3[-1].append("d")
l3.append("11111")
print(li)
print(l3)

print(id(li))
print(id(l3))

4.循环删除list

import copy

li = [1,1,2,3,4,5,6,7,8,9]
l3 = copy.deepcopy(li)

for i in l3:  循环删除list时，会导致下标错乱，所以不能直接循环需要删除的list，可以循环值相同的其他list来解决
    if i%2!=0:
        li.remove(i)

print(li)