python傳遞兩個導入類之間的變量

Question

因此，我會直接指出，並將在最後插入代碼，但主要問題是我正在處理一個python文件（對於僞GUI使用kivy） ，問題是我爲每個屏幕都有單獨的文件，所以它們也會作爲單獨的應用程序工作，而我所無法做到的是將信息從一個類導入到另一個類，即使它們實際上來自同一個文件。已經閱讀過類似的問題，並已經理解如何在相同的代碼中將變量從一個變量傳遞到另一個變量，但是仍然無法完成這項工作。

這裏是代碼，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() 

，顯然會感謝任何幫助，您可以帶上。

Answer 1

你應該能夠用下面的方式來讀取變量SeeContactScreen：

-add的類屬性：

class SeeContactScreen(Screen): 

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

- 和更改此屬性，當你調用屏幕：

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