What is the difference between "command" option and bind method?

[ananth21]

what is the difference between "command" option and bind method,
and what is the purpose of passing event object in callback methods

def callback(event):
              pass

[bvdet]

A Tkinter Button can be configured with a command callback. The callback function is executed when the button is pushed.

Button(frame, text="Exit", fg="green", bg="black", command=master.destroy)

A Tkinter Button can be bound to an event such as "<ButtonRel ease-1>". In effect it would behave in a similar manner in the example:

btn = Button(frame, text="Exit", fg="green", bg="black")
btn.bind(sequence="<ButtonRelease-1>", func=master.destroy)

The difference in the bound event is function master.destroy must be defined to receive an argument event The event object event carries a lot of information.