Python课程第三天作业

一、统计⽂件数据中出现的的所有字符与该字符出现的个数(不区分⼤⼩写,标点与空格也算)

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⽂件内容： hello friend, can you speak English! # 结果： { 'h': 1, 'e': 4, 'l': 3, 'o': 2, ' ': 5, ... }

代码如下：

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#!/usr/bin/env python # -*- coding: utf-8 -*-   #统计⽂件数据中出现的的所有字符与该字符出现的个数 #字符串方式 char_dict1 = {} with open('test.txt', 'r', encoding='utf-8')as f:     f_str = f.read()     for k1 in f_str:         char_dict1[k1.lower()] = f_str.lower().count(k1.lower()) print(char_dict1)   #seek方式 char_dict2 = {} with open('test.txt', 'r', encoding='utf-8')as f2:     for k2 in f2.read():         f2.seek(0,0)         char_dict2 [k2.lower()] = f2.read().lower().count(k2.lower()) print(char_dict2 )   #列表方式 char_dict3={} char_lsit=list() with open('test.txt', 'rt',encoding='utf-8')as f:     for k5 in f.read():         char_lsit.append(k5.lower())     f.seek(0, 0)     for k6 in f.read():         if k6 in char_lsit:             char_dict3[k6]=char_lsit.count(k6) print(char_dict3)

二、 统计⽂件中⼤写字⺟、⼩写字⺟、数字及其他字符出现的次数

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# ⽂件内容： Abc123,-+XYZopq000.?/ # 结果： { '⼤写字⺟': 4, '⼩写字⺟': 5, '数字': 6, '其他字符': 6 }

代码如下：

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#!/usr/bin/env python # -*- coding: utf-8 -*-   #统计⽂件中⼤写字⺟、⼩写字⺟、数字及其他字符出现的次数 capital_count=0 lowercase_count=0 number_count=0 special_characters_count=0 with open('test2.txt','rt',encoding='utf-8') as f:     string=f.read() for i in string:     if (ord(i) >= 33 and (ord(i)<= 47)) or ((ord(i) >= 58 and (ord(i)<= 64) )):         special_characters_count += 1     elif ord(i) >= 48 and (ord(i)<= 57):         number_count += 1     elif ord(i) >= 65 and (ord(i)<= 90):         capital_count += 1     elif ord(i) >= 97 and (ord(i)<= 122):         lowercase_count += 1 string_count = {'大写字母':capital_count, '小写字母':lowercase_count, '数字':number_count, '特殊字符':special_characters_count} print(string_count)

三、登录注册系统

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# 需求分析： 1.可以循环登录注册，输⼊1代表选择登录功能，输⼊2代表注册功能，输⼊0代表退出，其他输⼊代表 输⼊有误，重输 2.⽤户的账号密码信息存放在usr.txt⽂件中，保证⽤户注册成功后，重启系统，⽤户信息仍然保存 3.登录在账号验证通过才输⼊密码验证登录，账号验证三次失败⾃动进⼊注册功能，登录三次验证失败 ⾃动退出系统 4.第⼀次注册，⽂件写⼊ 账号:密码 信息，再次注册追加写⼊ |账号:密码 信息

代码如下：

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#!/usr/bin/env python # -*- coding: utf-8 -*- import time white_user_set=[] black_user_set=[] user_list=[] white_userDB='userDB' black_userDB='user_blackDB'   with open(black_userDB, 'r+',encoding='utf-8') as black_f:     for black_user  in black_f.readlines():         black_user = black_user.strip("\n")         black_user_set.append(black_user)   with open(white_userDB, 'r+') as white_f:     for file in white_f.readlines():         file = file.strip("\n")         user_field,passwd_field,remarks_field= file.split('|')         name1_field, user=user_field.split(':')         name2_field, passwd = passwd_field.split(':')         name3_field, remarks = remarks_field.split(':')         white_user_set.append({name1_field:user,name2_field:passwd,name3_field:remarks})         user_list.append(user) print(white_user_set)     def mod_info(file_name,old_str,new_str):     mod_date=''     with open(file_name,'r+',encoding='utf-8') as f:         for line in f:             line = line.replace(old_str,new_str)             mod_date += line     with open(file_name, 'w', encoding='utf-8') as f1:         f1.writelines(mod_date)   #用户注册函数 def user_register():     count=0     while True:         count+=1         register_name = input('创建用户名：')         register_passwd = input('创建密码：')         register_passwd1 = input('创建密码：')         user_remarks = input('输入您的备注信息,默认为空：')         if user_remarks == '':             user_remarks = 'null'         if register_passwd == register_passwd1:             if register_name in user_list:                 print('用户已存在，请重新创建')             else:                 user_information=register_name+':'+register_passwd+':'+user_remarks                 print(user_information)                 print(type(user_information))                 with open(white_userDB,'a+') as f:                     f.write('\n')                     f.write(user_information)                 print('恭喜您，用户创建成功！！！')                 return 0         else:             if count == 3:                 print('失败次数超过上限，程序退出')                 exit(3)             print('两次密码不一致，请重新创建2') <br>#用户登录函数 def user_login():     Flag = True     user_failures = 0     all_failures = 0     while Flag:         login_name = input('请输入用户名：')         login_passwd = input('输入密码：')         print(login_name,login_passwd)         if login_name in black_user_set:             print('该用户已被锁定，请联系您的管理员！')             exit(3)         if login_name in user_list:             for subscript,line in enumerate(white_user_set):                 if (login_name == line['name']) and (login_passwd == line['passwd']):                     print('登录成功')                     print('正在登录。请稍后')                     time.sleep(1)                     print('')                     print('='*30)                     print('欢迎来到 250 世界')                     print('='*30)                     Flag = False                     break             for subscript,line in enumerate(white_user_set):                 if (login_name == line['name']) and (login_passwd != line['passwd']):                     user_failures += 1                     all_failures += 1                     if (user_failures == 3):                         print('验证失败次数过多，用户被锁定')                         with open(black_userDB,'a+') as f:                             f.write(login_name+'\n')                             exit(2)                     print('用户名或密码不正确，登录失败,请重新登录 2 ')                     break         else:             print('用户名或密码不正确，登录失败,请重新登录 3 ')             all_failures += 1             if all_failures == 6:                 print('失败次数过多，请确认后再登录 4')                 exit(1)   #用户信息修改函数 def user_info_mod(user_name,user_passwd,remarks):     user_login     print('''     1.修改密码     2.修改备注信息     ''')     info=input('请根据提示，选择您要修改的用户信息')     if info == '1':         confirm_password = input('请输入您当前的密码：')         new_password = input('请输入您要修改的密码：')         if confirm_password == user_passwd:             print('您输入的当前密码有误，请程序输入！')         else:             for subscript, line in enumerate(white_user_set):                 if (user_name == line['name']):                     line[passwd]=new_password                     mod_info(white_userDB, confirm_password, new_password )     elif info == 2:         new_remarks=input('请输入您要修改的备注：')         for subscript, line in enumerate(white_user_set):             if (user_name == line['name']):                 line[remarks]=new_remarks                 mod_info(white_userDB, line[remarks], new_remarks)     else:         print('无效的输入，请重新输入！')       #主函数 def main():     while True:         count=0         print('1  注册用户：')         print('2  登录系统：')         print('3  修改备注信息：')         user_operation=input('请选择您的操作：')         print(type(user_operation))         if user_operation == '1' or user_operation == '3':             user_register()             break         elif user_operation == '2':             user_login()             break         else:             count+=1             if count == 3:                 print('失败次数过多，请确认后再登录')                 exit(3)             print('非法的输入，请重试')   if __name__ == '__main__':     main()