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a=input("your name:")
# a=input(your name:)
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# 练习一
# i=0
# while i<10:#while (i < 10):去除冗余的括号
# i += 1
# if i==7:
# pass
# else:
# print(i)
# # 练习二
# i=1
# sum=0
# while i<101:
# sum += i
# i += 1
# print(sum)
# # 练习三
# i=0
# while i<50:
# s = 2*i+1
# i += 1
# print(s)
# # 练习四
# i=1
# while i<51:
# s = 2*i
# i += 1
# print(s)
# 练习五
# i=1
# sum1=0
# sum2=1
# while i<50:
# sum1+=2*i
# i += 1
# sum2+=2*i-1
# sum=sum2-sum1
# print(sum)
#练习六
flag=0
name="shang"
password=123
while flag<3:
s=input("用户名:")
m=int(input("密码:")) #因为输入的都是字符串，所以比较时需要转换成int类型
if s!=name or m!=password:
flag+=1
if flag==3:
print("超过三次登录失败")
else:
print("请重新输入账户密码")
else:
print("登录成功")
break
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原文：https://www.cnblogs.com/testor/p/9224466.html