python 3.5将对象从一个类传递到另一个类

Question

我想弄清楚如何将数据从一个类传递到另一个类。我对python的了解非常有限，我使用的代码已经从本网站的示例中获取。

我试图将用户名从“UserNamePage”类传递到“WelcomePage”类。有人可以告诉我如何做到这一点。我将添加更多页面，并且需要在不同页面之间传递数据。

以下是完整的代码 - 如上所述，大部分代码都来自其他示例，我正在使用这些示例进行学习。

import tkinter as tk 
from tkinter import * 
from tkinter import ttk 
from tkinter import messagebox 
import datetime 
import re 

def Chk_String(mystring): 
    Allowed_Chars = re.compile('[a-zA-Z_-]+$') 
    return Allowed_Chars.match(mystring) 


def FnChkLogin(Page): 

    booAllFieldsCorrect = False; 

    myFName = Page.FName.get() 
    myFName = myFName.replace(" ", "") 

    myLName = Page.LName.get() 
    myLName = myLName.replace(" ", "") 


    if myFName == "": 
     messagebox.showinfo('Login Ifo is Missing', "Please type in your First Name") 
    elif not Chk_String(myFName): 
     messagebox.showinfo('First Name Error:', "Please only use Leter or - or _") 
    elif myLName == "": 
     messagebox.showinfo('Login Info is Missing', "Please type in your Last Name") 
    elif not Chk_String(myLName): 
     messagebox.showinfo('Last Name Error:', "Please only use Leter or - or _") 
    else: 

     booAllFieldsCorrect = True; 

     if booAllFieldsCorrect == True: 
      app.geometry("400x200") 
      app.title("Welcome Screen")   
      PageController.show_frame(app,"WelcomePage") 

def FnAddButton(Page,Name,Label,Width,X,Y,FnAction): 
    Name = ttk.Button (Page, text=Label,width=int(Width),command=FnAction) 
    Name.place(x=int(X),y=int(Y)) 



class PageController(tk.Tk):  
    def __init__(self, *args, **kwargs): 

     tk.Tk.__init__(self, *args, **kwargs) 
     container = tk.Frame(self) 

     container.pack(side="top",fill="both",expand="True") 

     container.grid_rowconfigure(0,weight=1) 
     container.grid_columnconfigure(0,weight=1) 

     self.frames={} 

     for F in (UserNamePage,WelcomePage): 
      page_name = F.__name__ 
      frame = F(container,self)  
      self.frames[page_name] = frame 
      frame.grid(row=0,column=0,sticky="nsew") 

     self.show_frame("UserNamePage") 

    def show_frame(self,page_name): 
     frame= self.frames[page_name] 
     frame.tkraise() 



class UserNamePage(tk.Frame): 


    def __init__(self,parent,controller): 

     tk.Frame.__init__(self,parent) 

     self.controller = controller 

     lblFName = Label(self,text="First Name ",relief=GROOVE,width=12,anchor=E).place(x=50,y=50) 
     lblLName = Label(self,text="Last Name ",relief=GROOVE,width=12,anchor=E).place(x=50,y=75) 

     self.FName = StringVar() 
     inputFName = Entry(self,textvariable=self.FName,width=25).place(x=142,y=50) 
     self.LName = StringVar() 
     inputLName = Entry(self,textvariable=self.LName,width=25).place(x=142,y=75) 

     cmdContinue = ttk.Button (self, text='Continue',width=9,command=lambda:FnChkLogin(self)).place(x=320,y=70) 


class WelcomePage(tk.Frame): 

    def __init__(self,parent,controller): 
     tk.Frame.__init__(self,parent) 
     self.controller = controller 

     UserNamePageData = UserNamePage(parent,controller) 
     UserFName = str(UserNamePageData.FName) 
     UserLName = str(UserNamePageData.LName) 

     strWelcome = "Welcome " + UserFName + " " + UserLName 

     lblWelcome = Label(self,text=strWelcome,relief=FLAT,width=50,anchor=W).place(x=25,y=25) 


if __name__ == "__main__": 
    app = PageController() 
    app.geometry("400x200") 
    app.title("User Page") 
    app.eval('tk::PlaceWindow %s center' % app.winfo_pathname(app.winfo_id())) 
    app.mainloop() 

Answer 1

在该方法中show_frame(self,page_name)类PageController，添加下列行

if page_name == 'WelcomePage': 
    self.frames['WelcomePage'].UserFName = self.frames['UserNamePage'].FName.get() 
    self.frames['WelcomePage'].UserLName = self.frames['UserNamePage'].LName.get() 

并取出两线UserFName = str(UserNamePageData.FName)和UserLName = str(UserNamePageData.LName)。

说明：必须在引用两个帧的地方完成（即类PageController）。