old_contents: """
  Isolate the Decimal part of a Number
  https://stackoverflow.com/questions/3886402/how-to-get-numbers-after-decimal-point
  """
  
  
  def decimal_isolate(number, digit_amount):
  
      """
      Isolates the decimal part of a number.
      If digitAmount > 0 round to that decimal place, else print the entire decimal.
      >>> decimal_isolate(1.53, 0)
      0.53
      >>> decimal_isolate(35.345, 1)
      0.3
      >>> decimal_isolate(35.345, 2)
      0.34
      >>> decimal_isolate(35.345, 3)
      0.345
      >>> decimal_isolate(-14.789, 3)
      -0.789
      >>> decimal_isolate(0, 2)
      0
      >>> decimal_isolate(-14.123, 1)
      -0.1
      >>> decimal_isolate(-14.123, 2)
      -0.12
      >>> decimal_isolate(-14.123, 3)
      -0.123
      """
      if digit_amount > 0:
          return round(number - int(number), digit_amount)
      return number - int(number)
  
  
  if __name__ == "__main__":
      print(decimal_isolate(1.53, 0))
      print(decimal_isolate(35.345, 1))
      print(decimal_isolate(35.345, 2))
      print(decimal_isolate(35.345, 3))
      print(decimal_isolate(-14.789, 3))
      print(decimal_isolate(0, 2))
      print(decimal_isolate(-14.123, 1))
      print(decimal_isolate(-14.123, 2))
      print(decimal_isolate(-14.123, 3))
  
new_contents: """
  Isolate the Decimal part of a Number
  https://stackoverflow.com/questions/3886402/how-to-get-numbers-after-decimal-point
  """
  
  
  def decimal_isolate(number: float, digit_amount: int) -> float:
  
      """
      Isolates the decimal part of a number.
      If digitAmount > 0 round to that decimal place, else print the entire decimal.
      >>> decimal_isolate(1.53, 0)
      0.53
      >>> decimal_isolate(35.345, 1)
      0.3
      >>> decimal_isolate(35.345, 2)
      0.34
      >>> decimal_isolate(35.345, 3)
      0.345
      >>> decimal_isolate(-14.789, 3)
      -0.789
      >>> decimal_isolate(0, 2)
      0
      >>> decimal_isolate(-14.123, 1)
      -0.1
      >>> decimal_isolate(-14.123, 2)
      -0.12
      >>> decimal_isolate(-14.123, 3)
      -0.123
      """
      if digit_amount > 0:
          return round(number - int(number), digit_amount)
      return number - int(number)
  
  
  if __name__ == "__main__":
      print(decimal_isolate(1.53, 0))
      print(decimal_isolate(35.345, 1))
      print(decimal_isolate(35.345, 2))
      print(decimal_isolate(35.345, 3))
      print(decimal_isolate(-14.789, 3))
      print(decimal_isolate(0, 2))
      print(decimal_isolate(-14.123, 1))
      print(decimal_isolate(-14.123, 2))
      print(decimal_isolate(-14.123, 3))
  
subject: Add typing and snake casing to maths/decimal_isolate.py (#7066)