[Python-Dev] PEP 557: Data Classes (original) (raw)

Eric V. Smith eric at trueblade.com
Sat Sep 9 21:00:53 EDT 2017

On 9/9/2017 11:41 AM, Gustavo Carneiro wrote:

Hi, it is not clear whether anything is done to totalcost:

def totalcost(self) -> float: Does this become a property automatically, or is it still a method call?  To that end, some examples of using a data class, not just defining one, would be helpful. If it remains a normal method, why put it in this example at all? Makes

Nothing is done with total_cost, it's still a method. It's meant to show that you can use methods in a Data Class. Maybe I should add a method that has a parameter, or at least explain why that method is present in the example.

I'm not sure how I'd write an example showing you can you do everything you can with an undecorated class. I think some text explanation would be better.

Eric.

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