Unable to use function from another python script

Question

I have the following script in a python file classfile.py

class Myclass:
    def testadd(x,y):
           return x+y

In another python file callfile.py

from classfile import Myclass
print testadd(3, 5)

while running the script callfile.py, I am getting

NameError: name 'testadd' is not defined

What's wrong with my code?

It's not a function, it's a method: https://docs.python.org/2/tutorial/classes.html — Ashwini Chaudhary, Aug 24 '15 at 08:51
@Ashwini How can I call that method from another without creating an object? — Prabhakar, Aug 24 '15 at 09:01
@PrabhakarD You can make it a static method, [this answer](http://stackoverflow.com/a/735978/4374739) explains how to do that. You'll still need to call it as `module.class.method_name` but it can do what you want. — SuperBiasedMan, Aug 24 '15 at 09:06

score 2 · Accepted Answer · edited Aug 24 '15 at 09:16

2

you can define the method as a "classmethod":

#!/usr/bin/python
class Myclass():
   @classmethod
   def testadd(cls, x, y):
       return x + y

Then you can use it in this way:

#!/usr/bin/python
from classfile import Myclass

print Myclass.testadd(3, 5)

without using the "classmethod" decorator you can only use it in this way:

#!/usr/bin/python
from classfile import Myclass

aclass = Myclass()
print aclass.testadd(4, 5)

edited Aug 24 '15 at 09:16

SuperBiasedMan

answered Aug 24 '15 at 09:10

Marvix

yep. static method is more appropriate in this case! – Marvix Aug 24 '15 at 09:13
1

see this [post](http://stackoverflow.com/questions/136097/what-is-the-difference-between-staticmethod-and-classmethod-in-python) – Marvix Aug 24 '15 at 09:16
Thanks @Marvix. Your answer helps me a lot..!! – Prabhakar Aug 24 '15 at 09:22

score 1 · Answer 2 · answered Aug 24 '15 at 09:23

1

You can use something like this.

classfile.py

class MyClass:
    def testadd(self, x, y):
        self.x = x
        self.y = y 
        return x+y

import classfile
ob = classfile.MyClass()
print ob.testadd(21,3)

answered Aug 24 '15 at 09:23

Vinay Ranjan