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Python f-string quiz (fstrings.wtf)
submitted 1 month ago by learnbyexample@programming.dev to c/python@programming.dev
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[-] tunetardis@piefed.ca 2 points 1 month ago

I think my most common use case is with dictionary lookups.

if (val := dct.get(key)) is not None:
    # do something with val

I've also found some cases where the walrus is useful in something like a list comprehension. I suppose expanding on the above example, you you make one that looks up several keys in a dict and gives you their corresponding values where available.

vals =  [val for key in (key1, key2, key3) if (val := dct.get(key)) is not None]
this post was submitted on 26 Jul 2025
77 points (97.5% liked)

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