gui_basic.py

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.entry = Tkinter.Entry(self)
        self.entry.grid(column=0,row=0,sticky='EW')
        self.entry.bind('<Return>',self.OnPressEnter)

        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.grid_columnconfigure(0,weight=1)
        self.resizable(True,False)

    def OnButtonClick(self):
        self.labelVariable.set('You clicked the button !')

    def OnPressEnter(self,event):
        self.labelVariable.set('You pressed enter !')

if __name__ == '__main__':
    app = simpleapp_tk(None)
    app.title('my application')
    app.mainloop()