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Editorial Team
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Asked: 2026-06-03T07:50:55+00:00

Any difference between a = session.query(Accounts).filter(Accounts.key = 4).first() and a = session.query(Accounts).filter(Accounts.key = 4)[0]

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Any difference between

a = session.query(Accounts).filter(Accounts.key = 4).first()

and

a = session.query(Accounts).filter(Accounts.key = 4)[0]

?

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1 Answer

  1. Editorial Team

    As @mata indicated and pointed to the source code, there is no difference in the execution path of the two. In fact, you can also enable SQL logging by setting echo=True when you create an engine, and you will see that the both SQL statements are exactly the same (some sort of SELECT ... FROM ... WHERE ....id = ? LIMIT ? OFFSET ?)

    But, if the Accounts.key is actually a primary key, the best way to get a persistent instance by the primary key is to use the Query.get method, which will generate SELECT ... FROM ... WHERE ....id = ? and it should be good enough. I assume it is not going to be faster, but is much cleaner.

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