Tkinter bind inconsistency - python-3.x

Question

This problem appears to be hard to duplicate -- as I am able to correctly do it in a shorter program. What I'm hoping for is maybe some guidance on what could be going wrong. I have posted the version where it works correctly:
import tkinter as tk
from tkinter import *
from tkinter import ttk
class DIS(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
tk.Tk.wm_title(self, "program")
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.usernameVar = StringVar()
self.frames = {}
for F in (StartPage, contactQues, nowTry, next):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row = 0, column = 0, sticky = "nsew")
self.show_frame(StartPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
button2 = ttk.Button(self, text = "Here's a Button", command= lambda: controller.show_frame(nowTry))
button2.pack()
class nowTry(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
self.entry1 = Entry(self)
self.entry1.pack()
self.button1 = ttk.Button(self, text = "Yes", command = self.go)
self.button1.pack()
self.entry1.bind("<Return>", self.go)
def go(self, event=None):
print (self.entry1.get())
self.controller.show_frame(contactQues)
class contactQues(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
self.entry1 = Entry(self)
self.entry1.pack(pady=10, padx=10)
self.button1 = ttk.Button(self, text = "Submit", command= self.UsernameSubmit)
self.button1.pack()
self.entry1.bind("<Return>", self.UsernameSubmit)
def UsernameSubmit(self, event=None):
UsernameEntryGet = self.entry1.get()
self.controller.usernameVar.set(UsernameEntryGet)
self.controller.show_frame(next)
class next(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, textvariable = self.controller.usernameVar)
label.pack() ###Label is posted with input correctly
The issue I'm having with my main program is that the self.controller.usernameVar label does not post like it does in this example (nothing shows up at all) when the Return key is pressed to submit the input. However, when the submit button is clicked with the mouse, the label appears properly.
So, given this information, I feel as if my bind("<Enter>"... command is being managed wrong. I've tried self.bind..., self.controller.bind..., self.entryX.bind... without success.
Any ideas with this framework what could be wrong?

Answer 1

I believe I figured it out. The issue was that in my full program, I had multiple bind commands. While I was trying to solve this issue, I had some entry prompts bound to the controller and others to the entry itself (e.g,. self.controller.bind in a few classes and self.entry.bind in others).
I changed them all to self.entry.bind and it apparently fixed it -- which is why this code snippet worked as expected.