Class Function and Static Method at the Same Time? (Python)

Question

Is it possible to have a function that not only behaves like a @staticmethod wrapped function but also like any other class function so that if one calls the function through an instance, the data from the instance can be passed?

example:

class Amazing(object):
    @static_and_class
    def func(x):
        return type(x)

apple = Amazing()

>>> print(apple.func())
>>> <class 'Amazing'>
>>> print(Amazing.func(2))
>>> <class 'int'>

That's a basic example of the system. Basically, what I want is a way to pass information like instance data if possible, but if the data was not there the function would take the necessary variables to execute its program.

Thanks to anyone who can solve this!!

There's no built-in function for this, but you can easily write such decorator. — Ashwini Chaudhary
– Ashwini Chaudhary, Commented Mar 29, 2015 at 21:04

Sidnoea · Accepted Answer · 2015-03-29 21:01:03Z

1

Any method of any class can be called through the class' name. An instance will automatically pass itself as the first parameter of any of its methods. So, if you have something like

class Bar:
    def bar(self):
        return type(self)

you can do

thing = Bar()
print(thing.bar())
print(Bar.bar(2))

and you will get

<class '__main__.Bar'>
<class 'int'>

with no problems. This is, of course, frowned upon; when writing methods for instances, the method should be written such that self is presumed to be an instance of the class it is written for.

answered Mar 29, 2015 at 21:01

Sidnoea

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3 Comments

Ashwini Chaudhary Over a year ago

Well that's only true for Python 3 where they removed the concept of un-bound methods.

Brandon H. Gomes Over a year ago

but my code has parts like self.foo where a self argument wouldn't work for non-instances

Sidnoea Over a year ago

You could use type-checking to take care of that, if you wanted to; split the behavior depending on whether or not the argument is an instance of the class.

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