[Python-ideas] data structures should have an .any() method

Antoine Pitrou solipsis at pitrou.net
Sun Sep 6 23:45:49 CEST 2009

Steven D'Aprano <steve at ...> writes:
> If you're expecting "exactly one result", then surely it should be an 
> error to receive more than one result? Rather than ask for "any" result 
> and ignoring any unexpected extra items, I think it would be better to 
> have a helper function that verifies you have got exactly one result.

Why do you need a helper function?
Simply write:

    x, = db.query("SELECT blah...")

and you'll get a ValueError if there isn't exactly one item in the sequence.



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