input: Write a function to find the maximum number from a list of non-negative integers. The function should return the maximum number in the list.
  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([42]) == 42
  assert find_max([]) == 0
  assert find_max([5, 7, 2, 9, 1]) == 9
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