I have a numpy array and would like to get the values from the array where
groups  of values are the same.

Select the groups of 0 where group is > 3 and change 0 to 5

This
[3, 2, 1, 0, 0],
[1, 0, 3, 0, 0],
[2, 0, 1, 3, 0],
[0, 2, 3, 3, 0]

to this
[3, 2, 1, 5, 5],
[1, 0, 3, 5, 5],
[2, 0, 1, 3, 5],
[0, 2, 3, 3, 5]

Regards
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