面试宝典

面试宝典

for i in "alex":
    pass
print(i)  # 输出x

面试题

lst = []
for i in lst:
    lst.append("alex")
    print(lst)  # 不会打印内容 因为lst是空的，循环不起来

    
lst = [1,2]
for i in lst:
    lst.append('alex')  
    print(lst)	# 循环打印lst中的内容 --此循环是死循环
    
    
lst = [1,2]
for i in lst:
    lst.append('alex')  
print(lst)	# 死循环 不会打印出内容


lst = []
for i in range(5):
    lst.append([])
print(lst)  # [[],[],[],[],[]]


lst = [1,2]
lst[0] = lst
print(lst)  # [[...],2]