numpy.setdiff1d() function in Python

numpy.setdiff1d() function find the set difference of two arrays and return the unique values in arr1 that are not in arr2.

Syntax : numpy.setdiff1d(arr1, arr2, assume_unique = False) Parameters : arr1 : [array_like] Input array. arr2 : [array_like] Input comparison array. assume_unique : [bool] If True, the input arrays are both assumed to be unique, which can speed up the calculation. Default is False. Return : [ndarray] 1D array of values in arr1 that are not in arr2. The result is sorted when assume_unique = False, but otherwise only sorted if the input is sorted.

Code #1 : Output :

[4 5 6]

  Code #2 : Output :

[2 4 6 8]