python传递两个导入类之间的变量

Question

因此，我会直接指出，并将在最后插入代码，但主要问题是我正在处理一个python文件（对于伪GUI使用kivy） ，问题是我为每个屏幕都有单独的文件，所以它们也会作为单独的应用程序工作，而我所无法做到的是将信息从一个类导入到另一个类，即使它们实际上来自同一个文件。已经阅读过类似的问题，并已经理解如何在相同的代码中将变量从一个变量传递到另一个变量，但是仍然无法完成这项工作。

这里是代码，至少是重要的部分;

contacts.py：

import kivy 

from kivy.uix.boxlayout import BoxLayout 
from kivy.uix.button import Button 
from kivy.uix.label import Label 
from kivy.uix.screenmanager import Screen 
from kivy.lang import Builder 
from functools import partial 

import time 

from neo4j.v1 import GraphDatabase, basic_auth 

neodb = GraphDatabase.driver("bolt://localhost:7687", auth=basic_auth("neo4j", "**********")) 
neosession = neodb.session() 

kivy.require("1.9.0") 

Builder.load_file("Apps/Contacts.kv") 


class ContactScreen(Screen): 

    cid = "" 

    def __init__(self, **kwargs): 
     super(ContactScreen, self).__init__(**kwargs) 
     self.bind(on_enter=self.contactlayout) 

    def contactlayout(self, *args): 

     global neosession 
     contacts = neosession.run("MATCH (a:Person) RETURN a.Name as name, a.Lastname as lastname, a.id as id ORDER" 
            " BY a.Lastname") 

     mainlayout = BoxLayout(orientation="vertical") 
     buttonlayout = BoxLayout(orientation="horizontal", size_hint=(1, None), height=22) 
     listlayout = BoxLayout(orientation="vertical") 

     screenlabel = Label(text="Contactos", size_hint=(1, None), height=20, font_size=20) 
     newcontact = Button(text="+", size_hint=(None, None), size=(20, 20), font_size=20) 
     newcontact.bind(on_release=self.tonewcontact) 

     for contact in contacts: 
      contactlbl = Button(text=contact["lastname"] + " " + contact["name"], size_hint=(1, None), height=26, 
           font_size=18, text_size=self.size, halign="left", valign="middle") 
      idn = contact["id"] 
      contactlbl.bind(on_press=partial(self.tocontact, contact["id"])) 
      listlayout.add_widget(contactlbl) 

     bottom = Label() 
     listlayout.add_widget(bottom) 

     buttonlayout.add_widget(screenlabel) 
     buttonlayout.add_widget(newcontact) 

     mainlayout.add_widget(buttonlayout) 
     mainlayout.add_widget(listlayout) 

     self.add_widget(mainlayout) 

    def tonewcontact(self, *args): 
     self.manager.current = "NewContactScreen" 

    def tocontact(self, cidn, *args): 
     global cid 
     cid = cidn 
     # print(cid) 
     self.manager.current = "SeeContactScreen" 


class NewContactScreen(Screen): 

    def __init__(self, **kwargs): 
     super(NewContactScreen, self).__init__(**kwargs) 

    def cancel(self, *args): 
     self.manager.current = "ContactScreen" 

    def submit(self, setname, setlastname, setnumber, setemail): 
     global neosession 
     if setname != "": 
      neosession.run("CREATE (a:Person {Name: {name}, Lastname: {lastname}, Number: {number}, Email: {email}, " 
          "id: {id}})", 
          {"name": setname, "lastname": setlastname, "number": setnumber, "email": setemail, 
          "id": time.strftime("%Y%m%d%H%M%S")}) 

      self.ids.name.theTxt.text = "" 
      self.ids.lastname.theTxt.text = "" 
      self.ids.number.theTxt.text = "" 
      self.ids.email.theTxt.text = "" 
      self.manager.current = "ContactScreen" 
     else: 
      pass 


class SeeContactScreen(Screen): 

    def __init__(self, **kwargs): 
     super(SeeContactScreen, self).__init__(**kwargs) 
     self.bind(on_enter=self.contactlayout) 

    def contactlayout(self, *args): 
     print(ContactScreen.cid) 

Brain.py：

import kivy 

from kivy.app import App 
from kivy.core.window import Window 
from kivy.uix.screenmanager import ScreenManager, Screen, NoTransition 
from kivy.clock import Clock 

import time 

from neo4j.v1 import GraphDatabase, basic_auth 

from Apps.OpenScreen import OpenScreen 
from Apps.Calculator import CalculatorScreen 
from Apps.Contacts import ContactScreen 
from Apps.Contacts import NewContactScreen 
from Apps.Contacts import SeeContactScreen 

neodb = GraphDatabase.driver("bolt://localhost:7687", auth=basic_auth("neo4j", "**********")) 
neosession = neodb.session() 

kivy.require("1.9.0") 

__author__ = 'enzocanessa' 

Window.clearcolor = (1, .5, 0, 1) 
Window.size = (480, 320) 
# Window.fullscreen = True 
Window.show_cursor = True 

class MenuScreen(Screen): 

    def display_time(self): 
     Clock.schedule_interval(self.give_time, 1) 

    def give_time(self, *args): 
     self.display.text = time.strftime("%a %Y-%m-%d %H:%M:%S") 


class BrainApp(App): 

    def build(self): 
     m = ScreenManager(transition=NoTransition()) 

     m.add_widget(OpenScreen(name="open_screen")) 
     m.add_widget(MenuScreen(name="MenuScreen")) 
     m.add_widget(CalculatorScreen(name="CalculatorScreen")) 
     m.add_widget(SeeContactScreen(name="SeeContactScreen")) 
     m.add_widget(NewContactScreen(name="NewContactScreen")) 
     m.add_widget(ContactScreen(name="ContactScreen")) 

     return m 

if __name__ == "__main__": 
    BrainApp().run() 

，显然会感谢任何帮助，您可以带上。

Answer 1

你应该能够用下面的方式来读取变量SeeContactScreen：

-add的类属性：

class SeeContactScreen(Screen): 

    def __init__(self, **kwargs): 
     super(SeeContactScreen, self).__init__(**kwargs) 
     self.cid = None 
     self.bind(on_enter=self.contactlayout) 

- 和更改此属性，当你调用屏幕：

def tocontact(self, cidn, *args): 
    self.manager.get_screen('SeeContactScreen').cid = cidn 
    self.manager.current = "SeeContactScreen"