Python 3.8+, assignment in lambda function

Question

I have following function:

sorted(
    [
        #...
    ],
    key=lambda x: (
        x.get("order", {}).get("data") is None,
        x.get("order", {}).get("data"),
    ),
)

Can I use assignment := here to store x.get("order", {}).get("data") in variable?

`:=` should work; but there are also [some ugly alternatives for older versions](https://stackoverflow.com/q/45337189/1639625) — tobias_k, Jul 21 '20 at 09:50

score 1 · Accepted Answer · answered Jul 21 '20 at 09:44

1

You can, just make sure to paranthesize the expression correctly:

sorted(
    [
        #...
    ],
    key=lambda x: (
        (y := x.get("order", {}).get("data")) is None,
        y,
    ),
)

answered Jul 21 '20 at 09:44

L3viathan

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Python 3.8+, assignment in lambda function

1 Answers1