CODEWITHSUNDEEP
pythonpydanticpydantic-settings
red888
red888

Reputation: 31652

Is there a way to prevent pydantic from calling my function used to find config files on import?

My class looks something like this:

class MyConfig(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=get_configs(),
    )

I didn't realize that my get_configs() seems to be getting called on import. I discovered this when I had a bug in that function and pytest collection was failing.

Is this a python behavior or something specific to how the model_config attribute of the BaseSettings class works? It doesn't make sense to me because I would expect my get_configs() function to only get called when the code that is actually instantiating MyConfig is executed.

Upvotes: 0

Views: 50

Answers (1)

tdelaney
tdelaney

Reputation: 77407

This is normal python behavior for any class. Python executes the body of the class definition the same as it would execute module level code - accounting for the fact that it is within the class. For instance, at module level, a function definition (e.g. def foo(): return 1), binds the already-compiled function to the name "foo" in the module namespace. In a class definition, a method (e.g., def foo(self): return 1), the function object is bound to "foo" in the class namespace.

In your case, the class level "model_config" is assigned the result of the function call.

Upvotes: 1

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