如何过滤列表中的元素并生成频率表

def generate_frequency_table(lst):
    frequency_table = {}
    
    for item in lst:
        if item in frequency_table:
            frequency_table[item] += 1
        else:
            frequency_table[item] = 1
    
    sorted_table = sorted(frequency_table.items(), key=lambda x: x[1], reverse=True)
    
    return sorted_table

# 示例用法
my_list = [1, 2, 3, 2, 1, 3, 4, 5, 1, 2, 3]
result = generate_frequency_table(my_list)
print(result)

[(1, 3), (2, 3), (3, 3), (4, 1), (5, 1)]