[remove duplicates while preserving order] #array

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[remove duplicates while preserving order] #array

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Last edited Jan 25, 2019

Created on Nov 13, 2018

This example demonstrates a Python function that removes duplicate elements from a sequence while preserving the original order of the remaining items. The function `remove_duplicates_while_preserving_order(seq)` uses a set (`seen`) to track encountered values, filtering the input via a list comprehension. The logic relies on the fact that `not seen.add(x)` evaluates to `True` only for unseen items, allowing the conditional expression to add new elements to the set while keeping the output in the same relative order as the input. The code shows a common Python idiom for deduplication without relying on external libraries.

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