SQL Alchemy - How to Delete from a model instance?

Ok I found it after further searching:

session.delete(instance)

You can fire a Single query for this.

For all records

session.query(MyModel).delete()
session.commit()

It will delete all records from it and if you want to delete specific records then try filter clause in the query. ex.

For specific value

session.query(MyModel).filter(MyModel.id==1).delete()
session.commit()