Python class attribute referencing

Question

This is a sample code that i found from one of the python class tutorial.

class MyClass:
    i = 12345
    def f(self):
        return 'hello world'

print MyClass.f
print MyClass.i

Once i run this, i am expecting the output result of "hello world" and "12345". But instead i am getting this

>>> 
<unbound method MyClass.f>
12345
>>>

why is it not giving me 'hello world'? How do i change my code so that it will print out "hello world"? P.S i have no clue about python classes and methods and just started learning.

Haz · Accepted Answer · 2013-04-03 03:17:31Z

7

Create an instance of MyClass first.

test = MyClass()
print test.f()
print MyClass.i

You don't need to create an instance of MyClass for i, because it is a class member, not an instance member.

answered Apr 3, 2013 at 3:17

Haz

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1 Comment

mgilson Over a year ago

This is right, but you might also want to mention that OP needs to call the method as well, otherwise python will just print out the information about the method rather than running it's code.

Aswin Murugesh · Accepted Answer · 2013-04-03 03:08:14Z

1

Always a function is called by its name, which is represented by (). So use MyClass.f()

answered Apr 3, 2013 at 3:08

Aswin Murugesh

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