python h5py读写追加矩阵

#encoding=utf-8
import h5py
import os
 
#要写入的数据
a1 = [[11, 12], [13, 17], [14, 15]]
b1 = [[145, 191, 113], [144, 167, 129]]
a2 = [[21, 22], [23, 27], [24, 25]]
b2 = [[