text: #!/usr/bin/env python3
  
  """
  Write a function that can sum up numbers. It should receive a list of n numbers.
  If no argument is provided, return sum of numbers 1..100.
  """
  
  
  def sum_numbers(numbers=None):
      if numbers is None:
          sum_of_num = 0
          for i in range(1, 101):
              sum_of_num += i
          return sum_of_num
      else:
          sum_of_num = 0
          for i in range(len(numbers)):
              sum_of_num += numbers[i]
          return sum_of_num
  
  
  print(sum_numbers(numbers=[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]))
  