[Python] SQLAlchemy how to define two models for the same table

I have a single table, and one of the columns is a varchar with two values ('groupA','groupB')

When I created my models I wanted to achieve two things:

1. model for groupA - that hold X amount of related functions
2. model for groupB - that hold Y amount of related functions

the functions are not the same for both models, though they represents the same table:

class GroupA(Base):
__tablename__ = 'groups'

id = Column('id', Integer, primary_key=True)
name = Column('name', String(80))
group_type = Column('type', String(15), default="groupA")


And for groupB:

class GroupB(Base):
__tablename__ = 'groups'

id = Column('id', Integer, primary_key=True)
name = Column('name', String(80))
group_type = Column('type', String(15), default="groupB")


So GroupA & B are the same table: "groups", but GroupA has 100 rows, groupB has 20rows

I want to prevent writing this all the time:

session.query(GroupA).filter(group_type = 'groupA')
session.query(GroupB).filter(group_type = 'groupB')


How can I configure my model with some kind of a "fitler" that when I'll query.all() it will return the data relavent for each model ? right now I receive all data in both models no matter which model I queried...

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