text: # see https://www.codewars.com/kata/5bbb8887484fcd36fb0020ca/solutions/python
  
  def catch_sign_change(lst):
      if lst == []: return 0
      plus = False if lst[0] < 0 else True
      minus = False if lst[0] >= 0 else True
      count = 0
      for number in lst:
          if number >= 0 and minus is True:
              count += 1
              minus, plus = False, True
          if number < 0 and plus is True:
              count += 1
              plus, minus = False, True
      return count
  
  print(catch_sign_change([1, 3, 4, 5]) == 0)
  print(catch_sign_change([1, -3, -4, 0, 5]) == 2)
  print(catch_sign_change([]) == 0)
  print(catch_sign_change([-47,84,-30,-11,-5,74,77]) == 3)