staticmethod in python

Going through byte of python 3, I tried to make sense of staticmethod in the section talking about class and Object variables.

In the Robot class, there is a howMany class method, declared as below

def howMany():
  print("we have {0:d} robots".format(Robot.population))
howMany = staticmethod(howMany)

or using decorator, it will be

def howMany():
  print("we have {0:d} robots".format(Robot.population))
howMany = staticmethod(howMany)

It was then called by the Robot class,


I couldn’t really understand what is the staticmethod role here though.
According to the Python documentation,

A static method does not receive an implicit first argument.
It can be called either on the class (such as C.f()) or on an instance (such as C().f()). The instance is ignored except for its class.

That explain a little bit more, seems a staticmethod can be called either by class or instance.
Then I try something like this,

class Human:
  def communicate():
    print("I talk")
  def move():
    print("I walk")
  move = staticmethod(move)

So a Human class have two class methods, communicate and move, but move is a staticmethod.

Steve = Human()
Traceback (most recent call last):
  File "", line 1, in 
TypeError: communicate() takes no arguments (1 given)
#communicate() is a class method, when object Steve try to call it, an error message is saying communicate take no arguments, but 1 is given. I guess that is object Steve trying to pass self to communicate()?
#It duly print out "I walk"

Seems to me, staticmethod is a way for object to access class method that otherwise wouldn’t be available to them. Is that the correct perception?

One thought on “staticmethod in python

  1. I had the exact same question today. Did you ever figure this out?? If you did, PLEASE let me know. Thanks a lot!

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