Passing variables between classes in Tkinter, Python 3 - class

Question

I'm kind of a newbie to Python, and I'm writing some code to take data via a user input and put it into a .csv file. To do that, the program needs to pass data from class to class.
To teach myself how to pass data, I took code from here. I did have to alter the code a bit to get it to start up, making sure that the make_widget and print_it functions can pull the "name" variable stored in self.app_data data structure properly.
from tkinter import *
from tkinter import ttk
class MyApp(Tk):
def __init__(self):
Tk.__init__(self)
self.app_data={'name': StringVar}
container = ttk.Frame(self)
container.pack(side="top", fill="both", expand = True)
self.frames = {}
for F in (PageOne, PageTwo):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky = NSEW)
self.show_frame(PageOne)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class PageOne(ttk.Frame):
def __init__(self, parent, controller):
ttk.Frame.__init__(self, parent)
self.controller=controller
ttk.Label(self, text='PageOne').grid(padx=(20,20), pady=(20,20))
self.make_widget(controller)
def make_widget(self, controller):
self.controller=controller
self.some_entry = ttk.Entry(self, textvariable=self.controller.app_data['name'], width=8)
self.some_entry.grid()
button1 = ttk.Button(self, text='Next Page',command=lambda: controller.show_frame(PageTwo))
button1.grid()
class PageTwo(ttk.Frame):
def __init__(self, parent, controller):
ttk.Frame.__init__(self, parent)
self.controller=controller
ttk.Label(self, text='PageTwo').grid(padx=(20,20), pady=(20,20))
button1 = ttk.Button(self, text='Previous Page',command=lambda: controller.show_frame(PageOne))
button1.grid()
button2 = ttk.Button(self, text='press to print', command= self.print_it())
button2.grid()
def print_it(self):
value=self.controller.app_data['name'].get()
print ('The value stored in StartPage some_entry = ', value)#What do I put here
#to print the value of some_input from PageOne
When I run this program, it does start up, and I can move from frame to frame, but it does not print the "name" variable.
When I close the window, I get the error:
TypeError: get() missing 1 required positional argument: 'self'
Which the traceback blames on the line:
value=self.controller.app_data['name'].get()
What am I doing wrong? For what it's worth, I'm writing the code in Python 3.5.
I really appreciate any help that you guys could give me.