[Tutor] how to remove the coming duplication

[Asokan Pichai]

On Thu, Nov 10, 2011 at 12:40 PM, lina <lina.lastname at gmail.com> 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]
>

Did you mean [2, 5, 7]


just remove the coming duplication, not unique the list.
>
> Thanks for any advice,
>

I am assuming that you want to remove ALL duplicates.

Option 1:

Look at a different data structure -- one that
does not have duplicates by design: namely sets

Option 2:

Sort the list and then remove duplicates as you did.
look at sorted(a)

Option 3:

This is probably the least efficient but has
the merit of retaining the original order

Count the occurrence of each item and remove 1 less
look at a.count()

I have chosen to indicate the directions; hope it helps

Asokan Pichai

Enjoy programming in python
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