学习Python第十天

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# with open("aaa",'r+',encoding='utf-8') as f:
#     data = f.read(1)
#     # print(data)
#     print(f.tell())
#     f.write('hello')
#     print(f.tell())

# with open('aaa','r+') as f1 ,open('aaa','a+') as f2:
#     print(f1.tell())
#     print(f1.read())
#     data = f1.truncate()
#     print(data)


# user = input('请输入用户名：')
# pwd = input("请输入密码：")
#
# with open('db', 'r+') as f1:
#     for i in f1:
#         # 默认strip没参数，空格，换行符自动去除，
#         # 有参数：移除两侧指定的值
#         i = i.strip()
#         line_list = i.split('$')
#         if user == line_list[0] and pwd == line_list[1]:
#             print("登录成功")
#             break
#         else:
#             print("账号或密码错误")
#             continue



# def register(user, pwd):
#     """
#     注册用户
#     1、打开文件
#     2、追加数据
#     3、用户名和密码用$连起来
#     :param user:
#     :param pwd:
#     :return:
#     """
#     with open('db', 'a') as f3:
#         temp = '
' + user + "$" + pwd
#         f3.write(temp)
#         print("注册成功")
#
# def user_exist(user):
#     """
#     验证用户名是否存在
#     :param user:
#     :return: 存在返回True
#     """""
#     with open('db', 'r', encoding='utf-8') as f2:
#         for i in f2:
#             i = i.strip()
#             line_list = i.split('$')
#             if user == line_list[0]:
#                 return True
#         return False
#
# def main():
#     print("欢迎登录")
#     num = input("1:登录，2：注册")
#     num = int(num)
#     if num == 1:
#         def login(user, pwd):
#             """
#             用户名、密码的验证
#             :param user: 用户名
#             :param pwd: 密码
#             :return: True,用户验证成功，False，用户验证失败
#             """
#             with open('db', 'r+') as f1:
#                 for i in f1:
#                     # 默认strip没参数，空格，换行符自动去除，
#                     # 有参数：移除两侧指定的值
#                     i = i.strip()
#                     line_list = i.split('$')
#                     if user == line_list[0] and pwd == line_list[1]:
#                         return True
#                 return False
#
#
#         while True:
#             user = input('请输入用户名：')
#             pwd = input("请输入密码：")
#             is_login = login(user, pwd)
#             if is_login:
#                 print('ok')
#                 break
#             else:
#                 print('no')
#                 continue
#     elif num == 2:
#         user = input("请输入用户名：")
#         pwd = input("请输入密码：")
#         re_user = user_exist(user)
#         if re_user:
#             print('用户名已经存在')
#         else:
#             register(user, pwd)
#
#     else:
#         print("没这选项")
#
# main()


# a1 = 123
# a2 = 456
# a3 = 0
#
# a3 = a1
# a1 = a2
# a2 = a3
# print(a1)
# print(a2)

# li = [11,22,33,7]
# temp = li[0]
# li[0] = li[1]
# li[1] = temp
# print(li)

# li = [33, 5, 1, 2,3,2,1,4,231,3,3221,112]
# for i in range(1,len(li)):
#     for k in range(len(li) - i):
#         if li[k] > li[k + 1]:
#             temp = li[k]
#             li[k] = li[k + 1]
#             li[k + 1] = temp
# print(li)

# def f(a1, a2):
#     print(a2)
#     if a1 >= 10000:
#         return
#     a3 = a1 + a2
#     r = f(a2, a3)
# f(0, 1)

# def f5(deepth, a1, a2):
#     print(deepth)
#     if deepth == 10:
#         return a1
#     a3 = a1 + a2
#     r = f5(deepth + 1,a2,a3)
#     return r
# ret = f5(1,0,1)
# print(ret)