基础知识（任务作业）

# xin = "xiaoming"
# zhiwei = "老师"
# gongsi = "北京市海淀区"
# print("姓名： %s" % xin)
# print("职位： %s" % zhiwei)
# print("公司： %s" % gongsi)

# print('--------------------------------------------------')
# print("欢迎使用用户管理系统")
# print("1. 注册新用户")
# print("2. 登录")
# print('--------------------------------------------------')
# name = ""
# password = ""
# 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("用户已经被占用！请重新操作")
#             continue
#         password = input("请输入密码：")
#         if len(password)<6:
#             print("密码不能小于六位")
#             
#         print("")
#     elif num == 2:
#         input_name=input("请输入用户名：")
#         input_password = input("请输入密码")
#         if name ==input_name and password == input_password:
#             print("登录成功")
#             break
#     else:
#         print("输入有误")
#         continue

# star = "abcdef"
# print(star[::-1])

# def tixing(a,b,h):
#     return (a+b)*h/2
# a = float(input("请输入梯形上边长"))
# b = float(input("请输入梯形下边长"))
# h = float(input("请输入梯形高"))
# mianji = tixing(a,b,h)
# print("梯形面积为",mianji)

# 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))

# def print_info():
#     print("++++++++++++++++++++++")
#     print("欢迎来到学生管理系统")
#     print("1.添加学生信息")
#     print("2.修改学生信息")
#     print("3.查看学生信息")
#     print("4.删除学生信息")
#     print("5.显示所有学生信息")
#     print("6.退出")
#     print("++++++++++++++++++++++")
# student_info = []
# 
# def add_info():
#     global student_info
#     id = input("请输入学生的id:")
#     name = input("请输入学生的姓名:")
#     age = input("请输入学生的年龄:")
#     sex = input("请输入学生的性别:")
#     dict_info = {}
#     dict_info["id"] = id
#     dict_info["name"] = name
#     dict_info["age"] = age
#     dict_info["sex"] = sex
#     student_info.append(dict_info)
#     print(student_info)
# 
# 
# 
# 
# def xiu_info():
#     global student_info
#     num_3 = int(input("请输入需要修改的学生的id"))
#     new_name = input("请输入新的名字  (回车不修改)")
#     student_info[num_3-1]["name"] = new_name
#     new_age = input("请输入新的年龄   (回车不修改)")
#     student_info[num_3-1]["age"] = new_age
#     new_sex = input("请输入新的性别   (回车不修改)")
#     student_info[num_3-1]["sex"] = new_sex
#     print(student_info)
# 
# 
# 
# def show_info():
#     global student_info
#     num_4 = int(input("请输入要查询信息的学生id"))
#     print(student_info[num_4-1])
# 
# 
# def del_info():
#     global student_info
#     num_5 = int(input("请输入要删除信息的学生id"))
#     del student_info[num_5-1]
#     all_info()
# 
# 
# def all_info():
#     print(student_info)
# 
# 
# 
# while 1:
#     print_info()
#     num_1 = input("请输入要执行的操作")
#     if num_1 == "1":
#         add_info()
#     elif num_1 == "2":
#         xiu_info()
#     elif num_1 == "3":
#         show_info()
#     elif num_1 == "4":
#         del_info()
#     elif num_1 =="5":
#         all_info()
#     elif num_1 == "6":
#         num_2 = input("你确定要退出码？(y or n)")
#         if num_2 == "y":
# 
#             break
# 
#         elif num_2 == "n":
#             continue

# 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<=5:
#     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)