<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def call_fget(self, obj) -> Any: """Return the predefined custom value when available, otherwise, the value defined by the getter function."""

        custom = vars(obj).get(self.name)
        if custom is None:
            return self.fget(obj)
        return custom