The following code is DB specific:
import sqlalchemy
# ...
ergebnis = session.query(
my_object.attr1).filter(sa.and_(
my_object.attr2 != 'NaN')).all() # PostgreSQL
# my_object.attr2 != None)).all() # sQLite
With PostgreSQL it is "'NaN'", with SQLite "None" (without single
quotes). Is there a SQLAlchemy-way to do this backend independant?
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