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)

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：

#!/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

# 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：

#!/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

# 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：

#!/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')

#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()