old_contents: from functools import reduce
  
  
  def checkio(i):
      digits = str(i).replace('0','')
      result = reduce(lambda x, y: int(x)*int(y), digits)
      return int(result)
  
new_contents: from functools import reduce
  
  
  def checkio(i):
      digits = str(i).replace('0','')
      result = reduce(lambda x, y: int(x)*int(y), digits)
      return int(result)
  
  
  
  golf=lambda n:(n%10or 1)*golf(n//10)if n else 1
  
subject: Update digits-multiplication.py