Question

python模拟用户登录系统，如何两个用户输入各自的密码才能登入？

要求：先检查用户名是否存在，再输入密码，输错3次密码重新登录。目前我的难题是对于不同用户对应自己的密码没办法下手

Answer 1

users = {'root': ['123', False], 'westos': ['456', False]}

while True:

    if all([x[1] for x in users.values()]):

        print('two users login successfully')

        break

    user = input('input user name:\t')

    if not users.get(user):

        print('unexist user')

        continue

    else:

        for i in range(3):

            pw = input('input password:\t')

            if users[user][0] == pw:

                print(f'user `{user}` login successfully')

                users[user][1] = True

                break

用一个字典存储username,pw以及登录状态. 10行判断是否两个人登录状态都为True,如果是,则打印并退出while. 否则13行输入username,如果name不存在,while continue; 如果存在, 进入else,输入密码,密码对则打印并修改状态.超过3次退出for进入while.

Answer 2

#我可以把我自己的成果送你，你来研究研究
import json #用来存储数据的模块
import os #用来进行文件操作
import sys #获取脚本所在目录用
import re #用来进行字符串操作

script_path = os.path.realpath(__file__)
PATH = os.path.dirname(script_path)
contents_list = []

if not os.path.exists(PATH+'\\'+'user_information'):
os.mkdir(PATH+'\\'+'user_information')

#主体函数，是主要的内容
def main(user_name):
obj = input('你现在想要干什么？\n1.新建一个文件 2.查看一个文件 3.更改密码 4.更改用户名\n')
if obj == '1':
file_name = input('请输入文件名（不用带后缀名）：')
print('请输入文件内容（如果完成输入的话就新建一行，然后输入“输入已完成”并回车来完成输入，如：\n这是第一行\n这是第二行\n这是第\
三行\n这是文件的最后一行\n输入已完成\n\n请输入：')

while True:
contents = input()
if contents == '输入已完成':
break
else:
contents_list.append(contents)

with open(PATH+'\\'+user_name+'.mmwj','r') as f:
file_names = f.readlines()

if file_name+'\n' in file_names:
print('害！写了半天，你文件名还是重复了，害！')
input('按回车键退出……')
else:
with open(PATH+'\\'+user_name+'\\'+file_name+'.json','w') as f:
json.dump(contents_list,f)
with open(PATH+'\\'+user_name+'.mmwj','a') as f:
f.write(file_name+'\n')

print('已成功！')
input('按回车键退出……')
elif obj == '2':
with open(PATH+'\\'+user_name+'.mmwj','r') as f:
file_name_list = f.readlines()
temporary_file_name_list = []

for i in file_name_list:
i = re.sub('\"|\'','',i)
i = re.sub('\n','',i)
temporary_file_name_list.append(i)
file_name_list = temporary_file_name_list

if not file_name_list == []:
print('这是你存过的所有的文件的列表：')
for i in file_name_list:
print(i)
user_file_name = input('请输入你想要查看的文件的文件名（不用带后缀）：')
if user_file_name in file_name_list:
with open(PATH+'\\'+user_name+'\\'+user_file_name+'.json','r') as f:
cont = json.load(f)
for i in cont:
print(i)
input('按回车键退出……')
else:
print('未找到此文件！')
input('按回车键退出……')
else:
print('空空如也……')
input('按回车键退出……')
elif obj == '3':
with open(PATH+'\\'+'user_information\\user_name_list.json','r') as n:
user_name_list_change = n.readlines()
tm_name_change = []
for i in user_name_list_change:
i = re.sub('\"\'','',i)
i = re.sub('\n','',i)
tm_name_change.append(i)
user_name_list_change = tm_name_change
with open(PATH+'\\'+'user_information\\user_password_list.json','r') as p:
user_password_list_change = p.readlines()
tm_password_change = []
for i in user_password_list_change:
i = re.sub('\"\'','',i)
i = re.sub('\n','',i)
tm_password_change.append(i)
user_password_list_change = tm_password_change

xyz = user_name_list_change.index('"'+user_name+'"')
old_right_password = user_password_list_change[xyz]
old_password = input('请输入旧密码：')

if '"' + old_password + '"' == old_right_password:
new_password = input('请输入新密码（不要带引号或中文！）：')
user_password_list_change[xyz] = new_password
with open(PATH+'\\'+'user_information\\user_password_list.json','w') as np:
for i in user_password_list_change:
np.write('"'+i+'"'+'\n')

print('密码已更改！')
input('按回车键退出……')
else:
print('对不起，旧密码错误。')
input('按回车键退出……')
elif obj == '4':
with open(PATH+'\\'+'user_information\\user_name_list.json','r') as n:
user_name_list_change = n.readlines()
tm_name_change = []
for i in user_name_list_change:
i = re.sub('\"\'','',i)
i = re.sub('\n','',i)
tm_name_change.append(i)
user_name_list_change = tm_name_change

xyz = user_name_list_change.index('"'+user_name+'"')
new_name = input('请输入新用户名：')

if '"' + new_name + '"' in user_name_list_change:
print('用户名已存在。')
input('按回车键退出……')
else:
user_name_list_change[xyz] = '"' + new_name + '"'
os.rename(PATH+'\\'+user_name+'.mmwj',PATH+'\\'+new_name+'.mmwj')
os.rename(PATH+'\\'+user_name,PATH+'\\'+new_name)

with open(PATH+'\\'+'user_information\\user_name_list.json','w') as np:
for i in user_name_list_change:
np.write(i+'\n')

print('用户名已更改！')
input('按回车键退出……')

#注册函数
def sign_up():
user_name = input('请输入用户名（不要带引号或中文！）：')
user_password = input('请输入密码（不要带引号或中文！）：')
if user_name == 'user_information':
print('用户名无效！')
input('按回车键退出……')
if not os.path.exists(PATH+'\\'+'user_information\\user_name_list.json'):
with open(PATH+'\\'+'user_information\\user_name_list.json','w') as con:
json.dump(user_name,con)
con.write('\n')
with open(PATH+'\\'+'user_information\\user_password_list.json','w') as con:
json.dump(user_password,con)
con.write('\n')

os.mkdir(PATH+'\\'+user_name)

with open(PATH+'\\'+user_name+'.mmwj','w') as f:
pass

print('账户创建成功 ！')
main(user_name)
else:
with open(PATH+'\\'+'user_information\\user_name_list.json','r') as f:
unsul = f.readlines()

if '"' + user_name + '"\n' in unsul:
print('用户名已存在。')
input('按回车键退出……')
else:
with open(PATH+'\\'+'user_information\\user_name_list.json','a') as con:
json.dump(user_name,con)
con.write('\n')
with open(PATH+'\\'+'user_information\\user_password_list.json','a') as con:
json.dump(user_password,con)
con.write('\n')

os.mkdir(PATH+'\\'+user_name)

with open(PATH+'\\'+user_name+'.mmwj','w') as f:
pass

print('账户创建成功 ！')
main(user_name)

#内容函数
def content():
user_obj = input('请问你是想登录，还是想注册？（输入1或2）：')

if user_obj == '1':
if not os.path.exists(PATH+'\\'+'user_information\\user_name_list.json'):
print('对不起，你现在还没有任何账户。')
yes_or_no = input('请问你要注册一个账户吗？（输入要或不要）：')
if yes_or_no == '要':
sign_up()
if yes_or_no == '不要':
input('按回车键退出……')
else:
with open(PATH+'\\'+'user_information\\user_name_list.json','r') as n:
name_list = n.readlines()
temporary_name_list = []

for i in name_list:
i = re.sub('\"|\'','',i)
i = re.sub('\n','',i)
temporary_name_list.append(i)
name_list = temporary_name_list
with open(PATH+'\\'+'user_information\\user_password_list.json','r') as p:
password_list = p.readlines()
temporary_password_list = []

for i in password_list:
i = re.sub('\"|\'','',i)
i = re.sub('\n','',i)
temporary_password_list.append(i)
password_list = temporary_password_list

contrast = dict(zip(name_list,password_list))
user_name = input('请输入用户名：')

if user_name not in name_list:
print('未找到此用户名！')
input('按回车键退出……')
else:
password = input('请输入密码：')
xpassword = contrast[user_name]
if xpassword == password:
print('登录成功！')
main(user_name)
else:
print('密码输入错误。')
input('按回车键退出……')
elif user_obj == '2':
sign_up()

content()