在Python中使用导入文件中的变量

问题描述

我正在尝试从另一个Imported的python文件中获取变量及其值。我有文件 Main .py和 Write .py。在Main文件中，我试图获取变量user_id等于new_id导入文件写入 .py中的变量。new_id正在为新用户扫描其标签（rfid）创建哈希。问题是在扫描标签后，变量user_id仍然为空。我想我可能是在扫描标签之前抓取了变量，有什么想法吗？我已经在下面的代码中发布了一些评论。

from tkinter import *
#Second File
import Write
from tkcalendar import DateEntry
from firebase import firebase

data = {}

global user_id

# Firebase 
firebase= firebase.FirebaseApplication("https://xxxxxxx.firebaseio.com/",None)

# button click
def sub ():
    global user_id

    #setting Variables from user input
    name = entry_1.get()
    last = entry_2.get()
    number = phone.get()

    # issue is here
    try:
    #Calling Function from other file
        Write.scan()

        if Write.scan():
        #getting the New User Id
            user_id= new_id

            #User Info being sent to the Database 
            data = {
            'Name #': name,'Last': last,'Number': number,'Card #':user_id
            }
            results = firebase.post('xxxxxxxx/User',data)
           
     except Exception as e:
        print(e)    

写 .py

import string
from random import*
import RPi.GPIO as GPIO
from mfrc522 import SimpleMFRC522
reader = SimpleMFRC522()

#Function being called
def scan():
    try:
        #Creating user hash
        c = string.digits + string.ascii_letters
        new_id = "".join(choice(c) for x in range(randint(25,25)))
        print("Please Scan tag")

        #Writing to tag
        reader.write(new_id)
        if reader.write(new_id):
            print("Tag Scanned")
    
        else:
            print("Scan Tag First")
        print("Scanning Complete")

    finally:
        GPIO.cleanup()

解决方法

不确定这是实际问题还是此处的格式，但是您的try：语句缩进在主文件中是错误的。