# [Tutor] how to remove the coming duplication

Christian Witts cwitts at compuscan.co.za
Thu Nov 10 08:55:16 CET 2011

```On 2011/11/10 09:10 AM, lina wrote:
> Hi,
>
> How to remove the coming duplication,
>
> Here I wrote one (not working):
>
>
>>>> a=['2', '5', '7', '5', '5']
>>>> for i in range(len(a)-1):
> 	if a[i+1]==a[i]:
> 		a.remove(a[i+1])
> 	if i not in range(len(a)):
> 		break
>
>
>>>> a
> ['2', '7', '5', '5']
>
> I wish to get a is [2,5,7,5]
>
> just remove the coming duplication, not unique the list.
>
>
> Best regards,
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
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>
>

def remove_coming_duplication(a_list):
return [element for idx, element in enumerate(a_list) if element !=
a_list[idx-1]]

>>> remove_coming_duplication([2, 5, 7, 5, 5])
[2, 5, 7, 5]
>>> remove_coming_duplication([2, 5, 7, 5, 5, 5, 5, 5, 7, 7, 5])
[2, 5, 7, 5, 7, 5]
>>> remove_coming_duplication(['2', '5', '7', '5', '5'])
['2', '5', '7', '5']

With this you're simply iterating through the list and checking if the
current element in the list is not equal to the previous element, and if
so it is not a duplicate and will be added to the new list you're creating.

--

Christian Witts
Python Developer

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