(self, s, instance, name)
return s
If s is not a valid type for this object, an exception should
        be thrown. The validated object should be returned.
If s is not a valid type for this object, an exception should
        be thrown. The validated object should be returned.
If s is not a valid type for this object an exception should be thrown . The validated object should be returned .
def validate(self, s, instance, name):
        """
        If s is not a valid type for this object, an exception should
        be thrown. The validated object should be returned.
        """
        return s
def validate ( self , s , instance , name ) : return s