按指定规则统计list中数据，groupby用法

有的情况下，只是想要简单地对list中数据，进行分组，查看，可以考虑使用groupby
代码：

# groupby需要排序后才能使用
def gb(num):
    if 0 <= num < 0.5:
        return '0~0.5'
    elif 0.5 <= num < 1:
        return '0.5~1'
    elif 1 <= num < 2:
        return '1~2'
    elif 2 <= num < 3:
        return '2~3'
    elif 3 <= num < 4:
        return '3~4'
    else:
        return '4~5'

summary_dict = [1.3357068035002726,
 0.5057801653990588,
 0.6080922133581622,
 0.5905691758469916,
 0.5652849576459099,
 0.7592879753368657,
 0.6826851249892935,
 0.6952457829111574,
 1.1777971206456959,
 0.9245340151342968]
summary_dict.sort()
result = [(k, list(g)) for k, g in groupby(summary_dict, key=gb)]

结果：