I'm making an application using tkinter, and I want to access global variable that I assign a value to from a tkinter Entry by a user. I'm following an MVC pattern for the creation of the application, and every window is in it's own class and I'm struggling basically with using data from one class to the next. In this context, I want to print the username entered by the user into the label in the class PageThree I've made a minimum reproduceable version of the code here:
import tkinter as tk
from tkinter import font as tkfont
from tkinter import messagebox
stored_username = "Tessa"
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")
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 (PageTwo, PageThree):
page_name = F.__name__
frame = F(parent=container, controller=self)
self.frames[page_name] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame("PageTwo")
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
class PageTwo(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
self.label_username_signup = tk.Label(self, text="Username")
self.label_password_signup = tk.Label(self, text="Password")
self.entry_username_signup = tk.Entry(self)
self.entry_password_signup = tk.Entry(self, show="*")
self.label_username_signup.grid(row=0, sticky=tk.E)
self.label_password_signup.grid(row=1, sticky=tk.E)
self.entry_username_signup.grid(row=0, column=1)
self.entry_password_signup.grid(row=1, column=1)
self.rgbtn = tk.Button(self, text="Register", command=self.log_details)
self.rgbtn.grid(columnspan=3)
button = tk.Button(self, text="Back",
command=lambda: controller.show_frame("StartPage"))
button.grid()
def log_details(self):
username = self.entry_username_signup.get()
global stored_username
stored_username = username
if username:
self.controller.show_frame("PageThree")
else:
tk.messagebox.showerror("Login Failure", "Incorrect username or password, please try again")
class PageThree(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self,parent)
self.controller = controller
global stored_username
lbl = tk.Label(self,text=name_entry)
lbl.grid(row=0,column=0)
def name_entry():
global stored_username
string = stored_username.get()
return string
if __name__ == "__main__":
app = SampleApp()
app.mainloop()
I think the closest thing to a related question I can find is: Taking input from the user in Tkinter However they are not dealing with modular classes.
