thx 4 the way out massimo, another way is to use if condition that check 
the data type
*e.g.*
if test0 != 'None' and type(test0) == 'str':
query = (db.test1.test0 == test0)
elif test0 != 'None' and type(test0) == 'list':
query = (db.test1.test0.belongs(test0) )
else:
query = (db.test1.id > 0)

thanks and best regards,
stifan

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