extremes

import statistics

def getExtremes(array, withIndex=False):
  """
  Return all extremes in an array.
  An "extreme" is any value in a group that exceeds the standard deviation in the positive or negative of the mean.
  withIndex returns all extremes in a tuple with their index in the array fomatted (<value>, <index>)
  """
  arrayMean = statistics.mean(array)
  stdDev = statistics.pstdev(array)

  final = []
  for item in (array if not withIndex else [(value, index) for index, value in enumerate(array)]):
    item, fitem = item[0] if withIndex else item, item
    if (item < arrayMean - stdDev) or (item > arrayMean + stdDev):
      final.append(fitem)
  return final