SqlAlchemy and mssqlserver

[Stefano]

Using sqlalchemy with pyodbc and mssqlserver
Why sa always generate identity ?

many thanks here the sample

tb = Table('prova',meta,Column('chiave', Integer, primary_key=True))
tb.create()

CREATE TABLE prova (
 chiave INTEGER NOT NULL IDENTITY(1,1), 
 PRIMARY KEY (chiave)
)


Stefano