python - What is the difference between command and bind in tkinter? -

i'm trying make button print string when it's pressed , print when it's released. know command atribute , bind method, know if it's possible accomplish using atributes or if have use methods. piece of code:

class motor:      def __init__(elemesmo, eixo , valorzero):          elemesmo.eixo = eixo          elemesmo.zero = valorzero       def aumenta(self):          print(self.eixo + str(self.zero+5))      def diminui(self):          print(self.eixo + str(self.zero-5))      def para(self):     print(self.eixo + str(self.zero))  eixox = motor('x',90) eixoy = motor('y',90)   class interface:     def __init__(elemesmo, widget):          quadro = frame(widget)          quadro.pack()          elemesmo.aumentary = button(quadro,text="aumentar y",height=10,width=20,command=eixoy.aumenta)          elemesmo.aumentary.pack(side=top)          elemesmo.diminuiry = button(quadro,text="diminuir y",height=10,width=20,command=eixoy.diminui) 

i can call method aumenta object eixo y when button aumentary pressed. call method para object eixo y when button aumentary released. how can it?

all event types outlined here, looking <button-1> (click down on button 1 (left mouse button if right handed)) , <buttonrelease-1> (release mouse button 1 (left button if right handed))

note wouldn't use command if bind both of these.

 elemesmo.aumentary = button(quadro,text="aumentar y",height=10,width=20)  elemesmo.aumentary.bind("<button-1>",eixoy.aumenta)  elemesmo.aumentary.bind("<buttonrelease-1>",eixoy.para) 

however must know when using bind callback called event object, if don't need can add optional , unused parameter callback:

 def aumenta(self, event=none):      print(self.eixo + str(self.zero+5))  def diminui(self, event=none):      print(self.eixo + str(self.zero-5))  def para(self, event=none):     print(self.eixo + str(self.zero))