python - Creating a dynamic multiplication application using scales -

i stuck trying make program dynamically multiples 2 numbers scale moved left right.

# module imports import tkinter tk  # function definitions class application(tk.frame):      def __init__(self, parent = none):         tk.frame.__init__(self, parent)         self.parent = parent         self.setupui()         self.createwidgets()      def setupui(self):         self.parent.title("multiplication scale")         self.grid()         self.centerwindow()      def centerwindow(self):         app_width = 400         app_height = 250          sw = self.parent.winfo_screenwidth()         sh = self.parent.winfo_screenheight()          x = (sw - app_width)/2         y = (sh - app_height)/2         self.parent.geometry('%dx%d+%d+%d' % (app_width, app_height, x, y))      def quit_pressed(self):         self.parent.destroy()      def createwidgets(self):         self.value1 = tk.intvar()         self.scalefirstn = tk.scale(self, from_=0, to=100,tickinterval=10,orient=tk.horizontal)         self.scalefirstn.grid(row=0,column=0,columnspan=5,ipadx=100,padx=40,pady=10,sticky="n")         self.value1 = tk.intvar()         self.scalesecondn = tk.scale(self, from_=0, to=100,tickinterval=10, orient=tk.horizontal)         self.scalesecondn.grid(row=1,column=0,columnspan=5,ipadx=100,padx=40,pady=0,sticky="n")         self.value2 = tk.intvar()         self.label1 = tk.label(self,textvariable=self.value1, text=0,foreground="blue")         self.label1.grid(row=5,column=0,columnspan=5, ipadx=5, sticky="wes")         self.label2 = tk.label(self,textvariable=self.value1, text=0,foreground="blue")         self.label2.grid(row=1,column=0,columnspan=5, ipadx=5, sticky="we")         self.label3 = tk.label(self,textvariable=self.value1, text=0,foreground="blue")         self.label3.grid(row=1,column=0,columnspan=5, ipadx=5, sticky="we")      def onscale(self, val):         value = self.scale.get()         self.value.set(value)  # main body root = tk.tk() app = application(root) root.mainloop() 

you creating value1 twice , not doing value2, onscale() wasn't doing anything. must set each scale widget's command option desired callback function (onscale in case).

def createwidgets(self):     self.value1 = tk.intvar()     self.scalefirstn = tk.scale(self, from_=0, to=100,tickinterval=10,orient=tk.horizontal, command=self.onscale, var=self.value1)     self.scalefirstn.grid(row=0,column=0,columnspan=5,ipadx=100,padx=40,pady=10,sticky="n")     self.value2 = tk.intvar()     self.scalesecondn = tk.scale(self, from_=0, to=100,tickinterval=10, orient=tk.horizontal, command=self.onscale, var=self.value2)     self.scalesecondn.grid(row=1,column=0,columnspan=5,ipadx=100,padx=40,pady=0,sticky="n")     self.label1 = tk.label(self,textvariable=self.value1, text=0,foreground="blue")     self.label1.grid(row=5,column=0,columnspan=5, ipadx=5, sticky="wes")     self.label2 = tk.label(self,textvariable=self.value2, text=0,foreground="blue")     self.label2.grid(row=6,column=0,columnspan=5, ipadx=5, sticky="we")     self.label3 = tk.label(self, text=0,foreground="blue")     self.label3.grid(row=7,column=0,columnspan=5, ipadx=5, sticky="we")  def onscale(self, val):     self.label3.config(text=self.value1.get() * self.value2.get())