I want to get the value of a field in a model, by passing the field name as string to a function, for that I defined a function inside the model like:

def get_value(self, key):
    key = key.replace('_', '.')
    return self.__dict__.get('_prefetch').get(key)

my question is, is there a predefined function in odoo models that can do that, if not, how can I do that in a more pythonic way