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Asked: 2026-06-13T20:15:24+00:00

My SQLAlchemy code: used_emails = list(db.execute(halo4.select(halo4.c.email != ”))) returns: [(80940L, ‘P7J4H-DFDMG-G6HMJ-W7PF9-MDTF1’, ‘1’, ‘first.last@domain.com’, datetime.datetime(2012,

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My SQLAlchemy code:

used_emails = list(db.execute(halo4.select(halo4.c.email != '')))

returns:

[(80940L, 'P7J4H-DFDMG-G6HMJ-W7PF9-MDTF1', '1', 'first.last@domain.com', datetime.datetime(2012, 11, 3, 3, 48, 58)), (80939L, 'GCTFY-QPK2Y-PX1CJ-W69QY-PHDGZ', '1', 'first.last@domain.com', datetime.datetime(2012, 11, 3, 15, 8, 15)), (80938L, 'R4XGV-PG461-RGXX7-9R47R-2RWYZ', '1', 'first.last@domain.com', datetime.datetime(2012, 11, 3, 15, 8, 27))]

How do I make SQLAlchemy only return:

[('first.last@domain.com', 'first.last@domain.com', 'first.last@domain.com')]

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1 Answer

  1. Editorial Team

    The following will give a list of the email column values:

    from sqlalchemy.sql.expression import select

used_emails = [row.email for row
               in db.execute(select([halo4.c.email], halo4.c.email!='')]

    Basically you are telling the select() function to generate a SELECT statement for just the email column. The result of execute() will be a ResultProxy so the job of the list comprehension is to create a list of email column string values from the single column rows obtained from the iterable ResultProxy.

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