python list dict util (分割，分组)

1.list数据分割为多个小列表  （java   lists.partition）

2. 分组      

import itertools

def partition(mylist, size):
    """
    :param mylist: 需要分割的列表
    :param size: 每几个分割一起
    :return: [[],[]]
    """
    return [mylist[i:i + size] for i in range(0, len(mylist), size)]


def groupby(mylist,key):
    """
    :param mylist: eg: [{"user":"sea","age":"23"},{"user":"sea1","age":"22"}]
    :param key:  eg: user
    :return:
    """
    result = {}
    # lstg = groupby(mylist,key=lambda x:x['no'])
    lstg = itertools.groupby(mylist, key=lambda x: x[key])
    for (key, group) in lstg:
        key_group = []
        for g in group:
            key_group.append(g)
        result[key] = key_group
    return result


if __name__ == '__main__':
    # 分割
    l = [i for i in range(15)]
    partition1 = partition(l, 3)
    print(partition1)