In the official documentation it says:

validates 
<https://docs.sqlalchemy.org/en/13/orm/mapped_attributes.html#sqlalchemy.orm.validates>(*names,
 
**kw)

Decorate a method as a ‘validator’ for one or more named properties.



I need to validate two incoming *-**attributes at the same time,  for 
example:


class Entity(Base):

    ....

    attr_timezone = Column(String)

    attr_timestamp = Column(MyTimeStamp)


When taking incoming arguments, `attr_timezone` as a string need to be 
first validated and converted to timezone instance before being attached to 
my custom class `MyTimeStamp`. Can `validates` do this?

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