The fact that it is not allowed is nothing to do with the 'return'. You *can* write return (x := x+1) What you can't (at present) do is use the walrus operator with an attribute: x = (self.a := self.a + 1) # SyntaxError I too have found times when this would be convenient. As Stephen says, Python often adds new features conservatively, then extends them later if/when it seems desirable. This happened with the '@' decorater: originally it came with all manner of restrictions, but eventually they were removed. IMO this was a good thing because it made the language more uniform, meaning you didn't have to remember what was allowed and what wasn't; so I hope the same will happen with the walrus operator. Best wishes Rob Cliffe On 09/10/2023 02:17, Dom Grigonis wrote:
Is there a reason why this is not allowed? return (self.mode := self.mode_valid(mode))
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