#1、使用while循环输出1 2 3 4 5 6     8 9 10# s=0# while s<10:#     s+=1#     if s==7:#         continue#     print(s)# for i in range(1,11):#     if i==7:#         continue#     print(i)#     i += 1#2、求1-100的所有数的和# s=0# i=0# while i<100:#     i+=1#     s+=i# print(s)# s=0# for i in range(1,101):#     s+=i# print(s)#3、输出 1-100 内的所有奇数# s=0# while s<100:#     s+=1#     if s%2==1:#         print(s)# for i in range(1,101):#     if i%2==1:#         print(i)#4、输出 1-100 内的所有偶数# s=0# while s<100:#     s+=1#     if s%2==0:#         print(s)# for i in range(1,101):#     if i%2==0:#         print(i)#5、求1-2+3-4+5 ... 99的所有数的和# s=0# i=1# while i<100:#     if i%2==1:#         s+=i#     elif i%2==0:#         s-=i#     i+=1# print(s)# s=0# for i in range(1,100):#     if i%2==1:#         s+=i#     elif i%2==0:#         s-=i# print(s)#6、用户登陆（三次机会重试）# count=0# while count<3:#     name=input(‘请输入用户名 ‘)#     passwd=input(‘请输入密码 ‘)#     if name==‘z‘ and passwd==‘123‘:#         print(‘登录成功‘)#         break#     else:#         print(‘用户名密码错误‘)#         count+=1# 改进版# user=‘z‘# pwd=‘123‘# count=0# while count<3:#     username=input(‘请输入用户名 ‘)#     if username == user:#         passwd=input(‘请输入密码 ‘)#         if  passwd==pwd:#             print(‘登陆成功‘)#             break#         else:#             print(‘密码错误，请重新输入‘)#             continue#     else:#         count += 1#         print(‘用户名错误,请重新输入‘)# else:#     print(‘您输错了3次，已锁定‘)