3 ms·

Does the new walrus := in python solve your problem?

• roelschroeven 4y ago
  The official name is assignment expression, which can be good to know to find documentation. Here's the PEP: https://peps.python.org/pep-0572/ https://peps.python.org/pep-0572/
  • otherme123 4y ago
    Curiously, searching the docs for "walrus" (https://docs.python.org/3/search.html?q=walrus https://docs.python.org/3/search.html?q=walrus) yields exactly the results you need, but searching for "assignment expression" yields the previous results mixed a lot of other results due to the word "expression".
• int_19h 4y ago
  Not really; where would you put it inside the []?
  • dragonwriter 4y ago
    In the example from the end of the earlier post: y for x in xs if (y:=x.ComputeSomething()).IsFoo and y.IsBar
    • int_19h 4y ago
      I suppose that works, although readability is not great, to put it mildly.
    • texaslonghorn5 4y ago
      Much better would be [(y:=x.ComputeSomething()) for x in xs if y.IsFoo and y.IsBar]
      • int_19h 4y ago
        That doesn't work, because that first subexpression is evaluated last, after "if".
  • ChadNauseam 4y ago
    For another example of how to use the walrus operator, I use it multiple times in the code I linked a few comments up