pass entry value from one class to another class tkinter python - python-3.x

Question

I want to pass entry values from one class to another using the get() method and i dont know how. Thanks in advance
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
# the container is where we'll stack a bunch of frames
# on top of each other, then the one we want visible
# will be raised above the others
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.x=tk.StringVar()
self.y=tk.StringVar()
self.key=tk.IntVar()
self.key.set(0)
self.frames = {}
for F in (StartPage, PageOne, PageTwo, LoggedIn, Balance):
page_name = F.__name__
frame = F(parent=container, controller=self)
self.frames[page_name] = frame
# put all of the pages in the same location;
# the one on the top of the stacking order
# will be the one that is visible.
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame("StartPage")
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="Banking Application", font=TITLE_FONT)
label.pack(side="top", fill="x", pady=10)
button1 = tk.Button(self, text="User Login",
command=lambda: controller.show_frame("PageOne"))
button2 = tk.Button(self, text="Create Account",
command=lambda: controller.show_frame("PageTwo"))
button1.pack()
button2.pack()
This is from where i want to pass the userid entry value to Balance class
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="Login Page", font=TITLE_FONT)
label.pack(side="top", fill="x", pady=10)
#user id entry block
tk.Label(self,text="UserID").pack(side="top", fill="x", pady=4)
self.userid=tk.Entry(self,textvariable=self.controller.x)
self.userid.pack(side="top", fill="x", pady=6)
#password entry block
tk.Label(self,text="Password").pack(side="top", fill="x", pady=4)
self.password=tk.Entry(self,textvariable=self.controller.y)
self.password.pack(side="top", fill="x", pady=6)
self.submit=tk.Button(self, text="SUBMIT",
command=self.login)
self.submit.pack();
button = tk.Button(self, text="Back to Main Menu",
command=lambda: controller.show_frame("StartPage"))
button.pack()
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
def getname(self):
name=self.controller.x.get()
print (name)
return name
def login(self):
getname(self);
for x in range(0,listsize):
if(self.controller.x.get()==files[x]):
print("welcome %s"%(self.controller.x.get()))
if(self.controller.y.get()==keys[x]):
bal=open(self.controller.x.get()+'.txt','r')
currbal=int(bal.read())
print("login success")
self.controller.key.set(1)
# print(self.controller.key=1)
self.controller.show_frame("LoggedIn");
break
else:
print("Invalid credentials")
How to pass userid from pageone to this class
class Balance(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="Balance Enquiry", font=TITLE_FONT)
label.pack(side="top", fill="x", pady=10)
username = PageOne.getname(self);
print(username)
if(self.controller.key==1):
print(username)
bal=open(username+'.txt','r')
currbal=int(bal.read())
label1 = tk.Label(self, text=currbal)
label1.pack(side="top", fill="x", pady=10)
###########
button = tk.Button(self, text="Go to the savings page",
command=lambda: controller.show_frame("LoggedIn"))
button.pack()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()