Python rrdtool.create()

Question

我有一个正在尝试创建的RRD数据库，并且我编写了几个循环来构建该命令，它工作良好，并产生预期的输出。当我实际尝试运行rrdtool时，问题就出现了。Python中的create命令。这个循环产生一个字符串，我们将其命名为rrdStr，包含以下内容:

'"0x04.rrd", "--step","5",
"DS:TEMP:GAUGE:10:0:100",
"DS:HUMIDITY:GAUGE:10:0:100",
"DS:LIGHT:GAUGE:10:0:1024",
"DS:POT:GAUGE:10:0:1024",
"RRA:AVERAGE:0.5:1:17142",
"RRA:MIN:0.5:1:17142",
"RRA:MAX:0.5:1:17142",
"RRA:AVERAGE:0.5:12:7200",
"RRA:MIN:0.5:12:7200",
"RRA:MAX:0.5:12:7200",
"RRA:AVERAGE:0.5:60:8640",
"RRA:MIN:0.5:60:8640",
"RRA:MAX:0.5:60:8640",
"RRA:AVERAGE:0.5:360:17532",
"RRA:MIN:0.5:360:17532",
"RRA:MAX:0.5:360:17532"'

据我所知，所有的引号和换行符都被正确转义了。

如果我像这样将字符串变量传递给rrdtool.create: rrdtool.create(rrdStr)，我得到输出

rrdtool.error: you must define at least one Round Robin Archive

但是，如果我将上述输出直接复制并粘贴到rrdtool.create()函数中，它就会像预期的那样工作，并创建数据库。

知道是什么原因导致的，如何解决它?

Answer 1

我终于想通了。您必须创建一个列表，而不是创建一个包含正确格式的所有命令的长字符串，rrd命令的每一行都在命令生成时添加到列表中。

上面的命令变成:

rrdStr = ["0x04.rrd", "--step","5"]
rrdStr += ["DS:TEMP:GAUGE:10:0:100"]
rrdStr += ["DS:HUMIDITY:GAUGE:10:0:100"]
rrdStr += ["DS:LIGHT:GAUGE:10:0:1024"]
rrdStr += ["DS:POT:GAUGE:10:0:1024"]
rrdStr += ["RRA:AVERAGE:0.5:1:17142"]
rrdStr += ["RRA:MIN:0.5:1:17142"]
rrdStr += ["RRA:MAX:0.5:1:17142"]
rrdStr += ["RRA:AVERAGE:0.5:12:7200"]
rrdStr += ["RRA:MIN:0.5:12:7200"]
rrdStr += ["RRA:MAX:0.5:12:7200"]
rrdStr += ["RRA:AVERAGE:0.5:60:8640"]
rrdStr += ["RRA:MIN:0.5:60:8640"]
rrdStr += ["RRA:MAX:0.5:60:8640"]
rrdStr += ["RRA:AVERAGE:0.5:360:17532"]
rrdStr += ["RRA:MIN:0.5:360:17532"]
rrdStr += ["RRA:MAX:0.5:360:17532"]

您可以将列表作为唯一的命令传递rrdtool.create(rrdStr)之前失败的相同命令将成功运行

Answer 2

在python2.6上使用rrdtool.create(*rrdStr)