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()