问如何使用rrdtool读取rrd文件

EN

<ds>
    <name> gauge1 </name>
    <type> COUNTER </type>
    <minimal_heartbeat> 600 </minimal_heartbeat>
    <min> 0.0000000000e+00 </min>
    <max> 1.0000000000e+08 </max>

    <!-- PDP Status -->
    <last_ds> 10109068304313 </last_ds>
    <value> 1.2791603667e+05 </value>//need to read this value
    <unknown_sec> 0 </unknown_sec>
</ds>

<ds>
    <name> gauge2 </name>
    <type> COUNTER </type>
    <minimal_heartbeat> 600 </minimal_heartbeat>
    <min> 0.0000000000e+00 </min>
    <max> 1.0000000000e+08 </max>

    <!-- PDP Status -->
    <last_ds> 8604908605180 </last_ds>
    <value> 1.2595538667e+05 </value>//need to read this value
    <unknown_sec> 0 </unknown_sec>
</ds>

file_path=r'/data/rrd_new/XXX.rrd'
rrdfilename = file_path
rrd = rrdtool.lastupdate(rrdfilename)
time = rrd['date']
ds = rrd['ds']

print(time,ds)

2022-05-23 11:25:01 {'gauge1': 10109068304313.0, 'gauge2':  8604908605180}

2022-05-23 11:25:01 {'gauge1': 127916.03667, 'gauge2':  125955.38667}