Significantly faster than numpy.unique for long enough sequences. Includes NA values. The return can be: Return numpy.ndarray or ExtensionArray. Return unique values from an Index. …

Oct 3, 2025 · Retrieving unique values from a column in a Pandas DataFrame helps identify distinct elements, analyze categorical data, or detect duplicates. For example, if a column B …

Find the unique elements of an array. Returns the sorted unique elements of an array. There are three optional outputs in addition to the unique elements: Input array. Unless axis is specified, …

May 8, 2025 · Getting unique values from a list in Python allows you to remove duplicates and work with distinct elements. For example, given the list a = [1, 2, 1, 1, 3, 4, 3, 3, 5], you might …

Mar 6, 2025 · Learn how to get unique values from a list in Python using `set ()`, list comprehension, and `dict.fromkeys ()`. This guide includes easy-to-follow examples.

Oct 15, 2012 · So, pass list with duplicate elements, we get set with unique elements and transform it back to list then get list with unique elements. I can say nothing about performance …

Return boolean if values in the object are unique.

Uniques are returned in order of appearance. This does NOT sort. Significantly faster than numpy.unique for long enough sequences. Includes NA values. The input array-like object …

A sort followed by an in-place unique is a far more efficient operation than converting a list to a set, and then sorting that. Even using a min-heap would be preferable.

Returns the unique values as a NumPy array. In case of an extension-array backed Series, a new ExtensionArray of that type with just the unique values is returned.