CODEWITHSUNDEEP
python-3.xclassimportstatic-methods
Prats
Prats

Reputation: 634

How can I call a static method from a class variable? It gives an error while importing in another notebook

I have 2 files: file1 and file2 in the same directory:

Contents of file1:

class Class1:
   class_variable = widgets.interactive_output(Class1.static_method, {'index' : index})

   @staticmethod
   def static_method(index):
       //body of the function

Contents of file2:

from file1 import Class1

When i run file2, I get following errors based on calls:

When I call it using:
1. Class1.static_method, {'index' : index})
   I get the error:
   NameError: name 'Class1' is not defined

2. static_method, {'index' : index})
   I get the error:
   NameError: name 'static_method' is not defined

How can I solve this? Any help is appreciated..

Upvotes: 2

Views: 168

Answers (2)

arabinelli
arabinelli

Reputation: 1516

Not sure how you plan to use Class1 in your code, but indeed the issue is that Class1 is not defined at the point when you reference it. You can use a classmethod to define a class attribute.

file1.py

class Class1:
    @staticmethod
    def static_method(index):
        //body of the function
        
    def __new__(cls, *args, **kwargs):
        cls.class_variable = widgets.interactive_output(cls.static_method, {'index' : index})
        return super(Class1, cls).__new__(cls)

Here I'm using __new__ as class method as it runs automatically at the instantiation of the class, but you can define your own.

Upvotes: 0

Arseny
Arseny

Reputation: 973

You are referring to Class1 in the assignment of the class variable, but Class1 isn't yet defined at that point.

You could skip the class variable in the definition of Class1 and add it to the class at a later point:

class Class1:
   @staticmethod
   def static_method(index):
       //body of the function

Class1.class_variable = widgets.interactive_output(Class1.static_method, {'index' : index})

Upvotes: 2

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