How Can We Eliminate Consecutive Duplicate Elements from a List in Python?

Eliminating Consecutive Duplicates in List Elements: Beyond Simple Removal to Element Elimination

While the initial approach successfully removed consecutive duplicates from the list elements, it fell short of eliminating the elements themselves. To achieve this, a more refined strategy is needed.

The solution provided through itertools.groupby() offers an efficient approach. It groups consecutive elements and returns the key for each group. By selecting the keys, we can retrieve the unique elements in the list:

L = [1,1,1,1,1,1,2,3,4,4,5,1,2]
from itertools import groupby
[key for key, _group in groupby(L)]

For the second part of the question, where the goal is to eliminate elements with consecutive duplicates, the modified code within the groupby() statement addresses this requirement:

[k for k, g in groupby(L) if sum(1 for i in g) < 2]

This approach employs a generator expression to calculate the number of elements in each group. By selecting keys for groups with less than two elements, we effectively eliminate the consecutive duplicates. The result is a concise and elegant solution.

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