1.
题目:
for i in "alex":
pass
print(i)
# x
#pass 或者 "..." 占位
2.
题目:
把"给阿姨倒杯卡布奇诺" 反过来
s = "给阿姨倒杯卡布奇诺"
print(s[::-1])
3.
题目:
lst = []
for i in lst:
lst.append("alex")
print(lst) # 不会打印内容 因为lst是空的
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 -- 不会打印内容
lst = []
for i in range(5):
lst.append([])
print(lst) # [[],[],[],[],[]]
lst = [1,2]
lst[0] = lst
print(lst) # [[...],2]
4.
题目: 一行代码对下边的列表去重
lst = [1,2,1,2,4,2,45,3,2,45,2345,]
print(list(set(lst)))
s = {1,2,3,4}