How to make a simple GUI application using Python tkinter

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This is a python code to write a simple gui application. try this code and see for yourself. If you have any questions comment them in the comment section. 



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import tkinter

class simpleapp_tk(tkinter.Tk):
 def __init__(self,parent):
  tkinter.Tk.__init__(self,parent)
  self.parent = parent
  self.initialize()

 def initialize(self):
  self.grid()

  self.entryVariable=tkinter.StringVar()
  self.entry = tkinter.Entry(self,textvariable=self.entryVariable)
  self.entry.grid(column=0,row=0,sticky='EW')
  self.entry.bind("<Return>",self.OnPressEnter)
  self.entryVariable.set(u"Enter text here.")

  button = tkinter.Button(self,text=u"Click me!",command=self.OnButtonClick)
  button.grid(column=1,row=0)

  self.labelVariable = tkinter.StringVar()
  label = tkinter.Label(self,textvariable=self.labelVariable,anchor="w",fg="white",bg="blue")
  label.grid(column=0,row=1,columnspan=2,sticky='EW')
  self.labelVariable.set(u"Hello!")

  self.grid_columnconfigure(0,weight=1)
  self.grid_rowconfigure(0,weight=1)
  self.resizable(True,False)
  self.update()
  self.geometry(self.geometry())
  self.entry.focus_set()
  self.entry.selection_range(0,tkinter.END)

 def OnButtonClick(self):
  self.labelVariable.set(self.entryVariable.get()+" (You clicked the button!)")
  self.entry.focus_set()
  self.entry.selection_range(0,tkinter.END)

 def OnPressEnter(self,event):
  self.labelVariable.set(self.entryVariable.get()+" (You pressed enter!)")
  self.entry.focus_set()
  self.entry.selection_range(0,tkinter.END)

if __name__ == "__main__":
 app = simpleapp_tk(None)
 app.title('My Application')
 app.mainloop()

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