i've already tried, but got the same result + another strange output during 
start web2py. here is the detail step i took.
1. create new web2py app (copas the welcome folder and rename it into test)
2. copas the scheduler.py into models (test\models\scheduler.py)

*test\models\scheduler.py*
db.define_table('asdf',
    Field('asdf'),
    auth.signature )

from gluon.scheduler import Scheduler

def demo1():
    db.asdf.insert(asdf = 'asdf')
    db.commit()

scheduler = Scheduler(db, tasks = dict(demo1 = demo1) )

scheduler.queue_task('demo1', prevent_drift = True, 
                     repeats = 0, period = 5)

3. running from windows command prompt :

cd C:\web2py
python web2py.py -K test -X

4. go to http://127.0.0.1:8000/test/appadmin/index and check the record of 
table asdf, scheduler_task, scheduler_run and scheduler_worker

no error traceback occured but the output is not expected for period of the 
record created on table 'asdf' and had a lot of scheduler_task records on 
the table.
another unexpected bonus is when running with the prevent_drift = True, the 
command prompt is hung for the first time, so that i must terminate the 
command line and then execute again, yet the prevent_drift = True result 
for period is still not expected.

thanks and best regards,
stifan

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