code: def national_significant_number(numobj):
      
      # If leading zero(s) have been set, we prefix this now. Note this is not a
      # national prefix.
      national_number = U_EMPTY_STRING
      if numobj.italian_leading_zero:
          num_zeros = numobj.number_of_leading_zeros
          if num_zeros is None:
              num_zeros = 1
          if num_zeros > 0:
              national_number = U_ZERO * num_zeros
      national_number += str(numobj.national_number)
      return national_number
docs: Gets the national significant number of a phone number.
  
      Note that a national significant number doesn't contain a national prefix
      or any formatting.
  
      Arguments:
      numobj -- The PhoneNumber object for which the national significant number
                is needed.
  
      Returns the national significant number of the PhoneNumber object passed
      in.