On 30 June 2018 at 09:49, Chris Barker - NOAA Federal via Python-Dev
<[email protected]> wrote:
>> On Jun 28, 2018, at 8:21 PM, Tim Peters <[email protected]> wrote:
>
> Seems it’s all been said, and Tim’s latest response made an excellent
> case for consistency.
>
> But:
>
>> Regardless of how assignment expressions work in listcomps and genexps, this
>> example (which uses neither) _will_ rebind the containing block's `x`:
>>
>> [x := 1]
>
> This reinforces my point that it’s not just about comprehensions, but
> rather that the local namespace can be altered anywhere an expression
> is used — which is everywhere.
>
> That trivial example is unsurprising, but as soon as your line of code
> gets a bit longer, it could be far more hidden.
The significant semantic differences between "{x : 1}" and "{x := 1}"
are also rather surprising :)
Cheers,
Nick.
--
Nick Coghlan | [email protected] | Brisbane, Australia
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