[Python] Python class attribute: How to refer to parent class attribute implicitly? [duplicate]

I can't understand why this isolated code don't work :

class SwitchSchema():

CONF_CONST_POWER = "constant_power"

class LightSchema(SwitchSchema):

TestVar = CONF_CONST_POWER

print(LightSchema.TestVar)


Error: File "main.py", line 7, in <module>, NameError: name 'CONF_CONST_POWER' is not defined

Are the class attributes not inherited ?

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