[Tutor] Possible usage of dict comprehensions

[Mark Lawrence]

On 20/10/2020 00:42, Alan Gauld via Tutor wrote:
> On 20/10/2020 00:19, Manprit Singh wrote:
>> is maintained. If I want to remove duplicates from a list while maintaining
>> the order of its elements, doing like this is a valid and a useful use case
> 
>>>>> l = [2, 4, 5, 3, 4, 5, 2, 1]   # List whose duplicates have to be
>> removed
>>>>> list({i:None for i in l})
>> [2, 4, 5, 3, 1]                   # Resultant list with duplicates removed
>> , order preserved
> 
> Well you have demonstrated that it works so it must be valid.
> How useful it is depends on whether you need to perform that operation.
> Assuming you do then yes its useful.
> 
> It's probably fairly efficient too but I haven't timed it.
> 

Plenty of background here 
https://stackoverflow.com/questions/480214/how-do-you-remove-duplicates-from-a-list-whilst-preserving-order

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence