Generator Unqiue On Key Python

Find the unique elements of an array.

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Returns the sorted unique elements of an array. There are three optionaloutputs in addition to the unique elements:

the indices of the input array that give the unique values
the indices of the unique array that reconstruct the input array
the number of times each unique value comes up in the input array

Parameters:	ar:array_like Input array. Unless axis is specified, this will be flattened if itis not already 1-D. return_index:bool, optional If True, also return the indices of ar (along the specified axis,if provided, or in the flattened array) that result in the unique array. return_inverse:bool, optional If True, also return the indices of the unique array (for the specifiedaxis, if provided) that can be used to reconstruct ar. return_counts:bool, optional If True, also return the number of times each unique item appearsin ar. axis:int or None, optional The axis to operate on. If None, ar will be flattened. If an integer,the subarrays indexed by the given axis will be flattened and treatedas the elements of a 1-D array with the dimension of the given axis,see the notes for more details. Object arrays or structured arraysthat contain objects are not supported if the axis kwarg is used. Thedefault is None. New in version 1.13.0.
Returns:	unique:ndarray The sorted unique values. unique_indices:ndarray, optional The indices of the first occurrences of the unique values in theoriginal array. Only provided if return_index is True. unique_inverse:ndarray, optional The indices to reconstruct the original array from theunique array. Only provided if return_inverse is True. unique_counts:ndarray, optional The number of times each of the unique values comes up in theoriginal array. Only provided if return_counts is True.

Parameters:

ar:array_like: Input array. Unless axis is specified, this will be flattened if itis not already 1-D.
return_index:bool, optional: If True, also return the indices of ar (along the specified axis,if provided, or in the flattened array) that result in the unique array.
return_inverse:bool, optional: If True, also return the indices of the unique array (for the specifiedaxis, if provided) that can be used to reconstruct ar.
return_counts:bool, optional: If True, also return the number of times each unique item appearsin ar.
axis:int or None, optional: The axis to operate on. If None, ar will be flattened. If an integer,the subarrays indexed by the given axis will be flattened and treatedas the elements of a 1-D array with the dimension of the given axis,see the notes for more details. Object arrays or structured arraysthat contain objects are not supported if the axis kwarg is used. Thedefault is None.
New in version 1.13.0.

Returns:

unique:ndarray: The sorted unique values.
unique_indices:ndarray, optional: The indices of the first occurrences of the unique values in theoriginal array. Only provided if return_index is True.
unique_inverse:ndarray, optional: The indices to reconstruct the original array from theunique array. Only provided if return_inverse is True.
unique_counts:ndarray, optional: The number of times each of the unique values comes up in theoriginal array. Only provided if return_counts is True.

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Notes

When an axis is specified the subarrays indexed by the axis are sorted.This is done by making the specified axis the first dimension of the arrayand then flattening the subarrays in C order. The flattened subarrays arethen viewed as a structured type with each element given a label, with theeffect that we end up with a 1-D array of structured types that can betreated in the same way as any other 1-D array. The result is that theflattened subarrays are sorted in lexicographic order starting with thefirst element.

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Examples

Return the unique rows of a 2D array

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Return the indices of the original array that give the unique values:

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Reconstruct the input array from the unique values: