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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def constants(self):
 """ Gets the constants from the class that acts like a namespace for constants. :rtype: dict<str,*> """

        ret = {}

        name = self.__class_name.split('.')[-1]
        constant_class = getattr(self.__module, name)
        for name, value in constant_class.__dict__.items():
            if re.match(r'^[A-Z][A-Z0-9_]*$', name):
                ret[name] = value

        return ret