Calling static method in python

Calling static method in python

You need to do something like:

class Person:
    @staticmethod
    def call_person():
        print hello person

# Calling static methods works on classes as well as instances of that class
Person.call_person()  # calling on class
p = Person()
p.call_person()       # calling on instance of class

Depending on what you want to do, a classmethod might be more appropriate:

class Person:
    @classmethod
    def call_person(cls):
        print hello person,cls

p = Person().call_person() # using classmethod on instance
Person.call_person()       # using classmethod on class

The difference here is that in the second example, the class itself is passed as the first argument to the method (as opposed to a regular method where the instance is the first argument, or a staticmethod which doesnt receive any additional arguments).

Now to answer your actual question. Im betting that you arent finding your method because you have put the class Person into a module Person.py.

Then:

import Person  # Person class is available as Person.Person
Person.Person.call_person() # this should work
Person.Person().call_person() # this should work as well

Alternatively, you might want to import the class Person from the module Person:

from Person import Person
Person.call_person()

This all gets a little confusing as to what is a module and what is a class. Typically, I try to avoid giving classes the same name as the module that they live in. However, this is apparently not looked down on too much as the datetime module in the standard library contains a datetime class.

Finally, it is worth pointing out that you dont need a class for this simple example:

# Person.py
def call_person():
    print Hello person

Now in another file, import it:

import Person
Person.call_person() # Hello person

Everybody has already explained why this isnt a static method but I will explain why you arent finding it. You are looking for the method in the module and not in the class so something like this would find it properly.

import person_module
person_module.Person.call_person() # Accessing the class from the module and then calling the method

Also as @DanielRoseman has said, you might have imagined that modules contain a class with the same name like Java although this is not the case in Python.

Calling static method in python

In python 3.x, you can declare a static method as following:

class Person:
    def call_person():
        print hello person

but the method with first parameter as self will be treated as a class method:

def call_person(self):
    print hello person

In python 2.x, you must use a @staticmethod before the static method:

class Person:
    @staticmethod
    def call_person():
        print hello person

and you can also declare static method as:

class Person:
    @staticmethod
    def call_person(self):
        print hello person

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