[Python] Python Enum class - Use Enum name argument to select Enum value within a function

I'm using Python 3.9. I have an Enum class like this:

class Color(Enum):
RED = 1
GREEN = 2
BLUE = 3


I want to use this enum class in a function with an argument which is a valid Enum name:

def some_func(color_name):
return Color.color_name.value


So, when I call the function:

>>> some_func(RED)


why does it not work?

Do I need to create a method for the Color class? That seems to defeat the purpose of have it as an Enum class.

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