列表和元组（相关代码）

# list1 = [8,4,2,1,23,344,12]
# sum = 0
# for x in list1:
#     print('数字的值:', x)
#     sum += x
# print('和:%d'%sum)
# num = int(input('请输入你要查找的数字:'))
# if list1.count(num)==0:
#     print('数字不存在!')
# else:
#     print('存在')

# arrScore =[]
# i = 1
# while i<= 3:
#     s = float(input('请录入第%d个人的成绩:'%i))
#     i += 1
#     arrScore.append(s)
# # 排序
# arrScore.sort()
# print(arrScore)

# users=[['tom1','123'],['tom2','123'],['tom3','123']]
# flag = False #标记变量
# name = input('请输入用户名')
# pwd = input('请输入用密码')
# for u in users:
#     if name==u[0] and pwd==u[1]:
#         flag= True
#         break
# if flag:
#     print('登录成功')
# else:
#     print('用户名或密码错误')

# def panduan(num_4):
#     if num_4%400 ==0 or num_4%4==0 and num_4%100!=0:
#         return "为闰年"
#     else:
#         return "不是闰年"
#
# if __name__ == '__main__':
#     nianfen = int(input("请输入年份："))
#     print(panduan(nianfen))

# a = '-'
# print(a*40)
# print('欢迎使用用户管理系统')
# print('1.注册新用户')
# print('2.登陆')
# print(a*40)
# name = ''
# pwd = ''
# flag = 'y'
# while flag == 'y':
#     num = int(input('请选择菜单：'))
#     if num== 1:
#         name = input('请输入用户名：')
#         if name =='admin':
#             print('用户名已经被占用！请重新操作 ')
#             continue
#         pwd = input('请输入密码 ：')
#         if len(pwd)< 6:
#             print('密码不能小于六位')
#         print('')
#     elif num== 2:
#         print('***********登陆系统**********')
#         name1 = input('请输入用户名：')
#         pwd1 = input('请输入密码：')
#         if name ==name1 and pwd == pwd1:
#             print('登录成功！！！')
#             break
#     else:
#         print('输入有误 ！')
#         continue
#     flag = input('是否继续（y/n）')
# print('谢谢使用！')