input: Write a function to find the maximum number from a list of non-negative integers. The function should return the maximum number found in the list. If the list is empty, the function should return 0.
  
  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
  
  assert find_max([1, 3, 12, 5, 8, 10])==12
  assert find_max([0, 0, 0, 0])==0
  assert find_max([1])==1
  assert find_max([])==0
  assert find_max([100, 99, 98, 101, 102])==102
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