Continue command in python tkinter?

[MLGpotato]

So I dont want to make code like this:

def A():
root = Button(root, text = "BOOM", command = B())

def B():
  #stuff here

For me its better like this:

def A():
  root = Button(root, text = "BOOM", command = #Goes straight to hello world)
  print("Hello world!")
  #rest of the code
  #rest of the code