input: Write a function to find pairs of negative numbers in a list.
  assert findNegativePairs([-2, -1, 0, 1, 2]) == [(-2, -1)]
  assert findNegativePairs([-3, -2, -1, 0, 1, 2, -4]) == [(-3, -2), (-3, -1), (-3, -4), (-2, -1), (-2, -4), (-1, -4)]
  assert findNegativePairs([1, 2, 3, 4]) == []
  assert findNegativePairs([-5, -6, -7]) == [(-5, -6), (-5, -7), (-6, -7)]
output: def findNegativePairs(lst):
      negatives = [x for x in lst if x < 0]
      pairs = [(negatives[i], negatives[j]) for i in range(len(negatives)) for j in range(i + 1, len(negatives))]
      return pairs