Factorial

n = None
Hasil = None
i = None

def text_prompt(msg):
  try:
    return raw_input(msg)
  except NameError:
    return input(msg)

def upRange(start, stop, step):
  while start <= stop:
    yield start
    start += abs(step)

def downRange(start, stop, step):
  while start >= stop:
    yield start
    start -= abs(step)


n = float(text_prompt('Masukkan Nilai Faktorial..'))
if n <= 0:
  print('Hasil Faktorial = 1')
else:
  Hasil = 1
  for i in (1 <= float(n)) and upRange(1, float(n), 1) or downRange(1, float(n), 1):
    Hasil = Hasil * i
  print(Hasil)