input: Write a function to find the maximum number from a list of non-negative integers.
  def find_max(list):
      max_num = 0
      for i in list:
          if i > max_num:
              max_num = i
      return max_num
  assert find_max([1, 3, 12, 5, 8, 10]) == 12
  assert find_max([0, 0, 0, 0]) == 0
  assert find_max([100, 99, 98, 101]) == 101
  assert find_max([]) == 0  # Considering empty list as having no maximum number, return 0
output: def find_max(list):
      if not list:
          return 0
      max_num = list[0]
      for i in list:
          if i > max_num:
              max_num = i
      return max_num