this post was submitted on 26 Jul 2025
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Python

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Python f-string quiz (fstrings.wtf)
submitted 1 week ago by learnbyexample@programming.dev to c/python@programming.dev
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[–] Eheran@lemmy.world 8 points 1 week ago (4 children)

Walrus operator. What did I just read?

[–] sugar_in_your_tea@sh.itjust.works 12 points 1 week ago (2 children)

I love the walrus operator:

if (x := some_function()):
    do_something(x)
else:
    # x is None or False or something, consider it invalid

The only thing I wish was different is adding a scope, which would make x invalid outside the block. But Python's scoping rules are too dumb to handle this case.

[–] tunetardis@piefed.ca 2 points 6 days 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]
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