3 ms·

I've come to like using: if foo := data.get("foo"): handle_foo(foo)

• pansa2 5y ago
  That’s exactly the same as this, though. foo = data.get("foo") if foo: handle_foo(foo) The only place I have found the walrus operator useful is in similar `while` loops, where the equivalent code would be: while True: foo = data.get("foo") if not foo: break handle_foo(foo)
  • heavenlyblue 5y ago
    No it's not the same. The visibility of variable "foo" is extended beyond it's usefullness if you use `if`.
    • pansa2 5y ago
      No, the visibility of `foo` is the same in both examples. Python’s `if` statements do not introduce a new scope.
  • ptx 5y ago
    The loop can be written using This One Weird Trick that Walruses Hate: for foo in iter(partial(data.get, "foo"), None): handle_foo(foo) So I would only use the walrus operator for the first example (the if statement), which even though it is exactly the same as doing it in two steps just feels nicer as a single step.