If 语句检查变量的值是否在 JSON 文件中 [英] If statement to check if the value of a variable is in a JSON file

问题描述

我是个新手，所以尽量不要评判我.我正在尝试基于旧的 2d 马里奥创建一个小的 2d 游戏.我已经有主窗口、注册和登录窗口，而且我有一个 json 文件来保存用户名和密码.现在，我正在尝试使登录功能正常工作.问题似乎是这一行:

I'm kind of new so try not to judge me. I'm trying to create a little 2d game based on the old 2d Mario. I already have home window, the sign up and login windows, and I've got a json file to save the usernames and passwords. Now, I'm trying to get the login function to work. The problem seems to be this line:

if plpaword in players['password']

这应该可以帮助你理解变量代表什么

This should help you understand what the variables stand for

f = open('player.json')
players = json.load(f)
plpaword = E2.get()

当我运行我的代码时，在我尝试登录之前，其他一切似乎都可以正常工作.登录后，它应该创建一个新窗口，但是什么也没有发生，它给出了错误:

When I run my code, everything else seems to work fine until I try to log in. After logging in, it should create a new window, but what happens is nothing happens and it gives the error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/tkinter/__init__.py", line 1883, in __call__
    return self.func(*args)
  File "/Users/kevin/PycharmProjects/ANewFile/ANewFile.py", line 101, in LI
    passwords = players['password']
KeyError: 'password'

我使用了这些模块:

from tkinter import *
import tkinter
import tkinter.messagebox
from tkinter import messagebox
from tkinter import Tk, Button, Frame, Entry, END
import random
import json

创建一个帐户并将其保存到我的 player.json 文件中:

Creating an account and saving it to my player.json file:

    def SU():
        try:
            plusname = E1.get()
            plpaword = E2.get()
            plpaword2 = E3.get()
            plemail = E4.get()
            if plpaword == plpaword2:
                if plusname in players:
                    messagebox.showerror(random.choice(error), "An account with that username already exists. "
                                                               "Please choose another.")
                else:
                    players[plusname] = {'password': plpaword, 'email': plemail}
                    with open('player.json', 'w') as f:
                        json.dump(players, f)
                    signup.destroy()
                    messagebox.showinfo("Account Created!", "Please log in to your new account through log in.")
            else:
                messagebox.showerror(random.choice(error), "Passwords did not match. Please try again")
        except:
            messagebox.showerror(random.choice(error), random.choice(errormsg))

推荐答案

根据SU()的代码，JSON文件里面的内容(也是players的内容代码>) 应该如下所示:

According to the code of SU(), the content inside the JSON file (also the content of players) should be something like below:

{
  "user1": {"password": "pass1", "email": "[e-mail]"},
  "user2": {"password": "pass2", "email": "[e-mail]"}
}

所以检查应该是:

plusname = E1.get()
plpaword = E2.get()
for player in players:
    if plusname == player and plpaword == players[plusname]["password"]:
        print("login successful")
        break
else:
    print("login failed")

即 players[password"] 应该是 players[plusname][password"].

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