如何高效地对大型二维列表进行分组（无需Pandas）？

def group_list_by_key(data):    grouped_data = {}    for k, v in data:        if k not in grouped_data:            grouped_data[k] = []        grouped_data[k].append(v)    return list(grouped_data.values())# 测试数据data = [['a',33],['a',0],['a',12],['a',3],['b',3],['b',0],['b',77],['c',1],['c',2],['c',5],['c',0],['c',11],['c',19]]print(group_list_by_key(data))

[[33, 0, 12, 3], [3, 0, 77], [1, 2, 5, 0, 11, 19]]