Re: Difference method vs attribut = function

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")