meta.reflect not honoring connection given?

from sqlalchemy import *
from sqlalchemy.pool import *

engine = create_engine("sqlite:////home/torsten/some.db",
poolclass=AssertionPool)
conn = engine.connect()
metadata = MetaData(conn, reflect=True)



   raise AssertionError("connection is already checked out" + suffix)
AssertionError: connection is already checked out at:
 File "demo.py", line 5, in <module>
   conn = engine.connect()

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