如何将列表列表转换为相对频率字典？

def list_to_relative_frequency_dict(lst):
    frequency_dict = {}
    list_length = len(lst)
    
    for item in lst:
        if item in frequency_dict:
            frequency_dict[item] += 1
        else:
            frequency_dict[item] = 1
    
    for key in frequency_dict:
        frequency_dict[key] /= list_length
    
    return frequency_dict

my_list = [1, 2, 2, 3, 4, 4, 4, 5]

{
  1: 0.125,
  2: 0.25,
  3: 0.125,
  4: 0.375,
  5: 0.125
}