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From: Thomas Passin <list1@tompassin.net>
Newsgroups: comp.lang.python
Subject: Re: Difference method vs attribut = function
Date: Sat, 29 Jun 2024 16:01:49 -0400
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On 6/28/2024 12:08 PM, Ulrich Goebel via Python-list wrote:
> Hi,
>
> a class can have methods, and it can have attributes, which can hold a function. Both is well known, of course.
>
> My question: Is there any difference?
>
> The code snipped shows that both do what they should do. But __dict__ includes just the method, while dir detects the method and the attribute holding a function. My be that is the only difference?
>
>
> class MyClass:
> def __init__(self):
> functionAttribute = None
>
> def method(self):
> print("I'm a method")
>
> def function():
> print("I'm a function passed to an attribute")
>
> mc = MyClass()
> mc.functionAttribute = function
>
> mc.method()
> mc.functionAttribute()
>
> print('Dict: ', mc.__dict__) # shows functionAttribute but not method
> print('Dir: ', dir(mc)) # shows both functionAttribute and method
>
>
> By the way: in my usecase I want to pass different functions to different instances of MyClass. It is in the context of a database app where I build Getters for database data and pass one Getter per instance.
>
> Thanks for hints
> Ulrich
https://docs.python.org/3/library/functions.html#dir -
object.__dict__¶
A dictionary or other mapping object used to store an object’s
(writable) attributes.
dir(object)
....
With an argument, attempt to return a list of valid attributes for that
object.
"functionAttribute" is a class method, not an instance method. If you
want an instance method:
class MyClass:
def __init__(self):
functionAttribute = None
self.instance_functionAttribute = None
def method(self):
print("I'm a method")