第5课

1a = [43,34,none,"break",12]
print(a[0]+a[2])

2import random
a= ["print","input", "while", "if", "else", "break","continue"]
while True:
    index = random. randint(0,6)
    print(a[index])

3a = ["print", "input","while", "if", "else", "break","continue"]
tmp = a[1]
a[1] = a[5]
a[5] = tmp
print(a)

4超过了列表长度