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我正在使用 python 模块lxml并psutil记录一些系统指标以放置在 XML 文件中并复制到远程服务器以供 php 解析并显示给用户。

但是，lxml 在将一些变量、对象等推送到我的 XML 的各个部分时给我带来了一些麻烦。

例如：

import psutil, os, time, sys, platform
from lxml import etree

# This creates <metrics>
root = etree.Element('metrics')

# and <basic>, to display basic information about the server
child1 = etree.SubElement(root, 'basic')

# First system/hostname, so we know what machine this is
etree.SubElement(child1, "name").text = socket.gethostname()

# Then boot time, to get the time the system was booted.
etree.SubElement(child1, "boottime").text = psutil.boot_time()

# and process count, see how many processes are running.
etree.SubElement(child1, "proccount").text = len(psutil.pids())

获取系统主机名的行有效。

但是，接下来的两行将显示启动时间和进程计数错误，其中：

>>> etree.SubElement(child1, "boottime").text = psutil.boot_time()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "lxml.etree.pyx", line 921, in lxml.etree._Element.text.__set__ (src/lxml/lxml.etree.c:41344)
 File "apihelpers.pxi", line 660, in lxml.etree._setNodeText (src/lxml/lxml.etree.c:18894)
 File "apihelpers.pxi", line 1333, in lxml.etree._utf8 (src/lxml/lxml.etree.c:24601)
 TypeError: Argument must be bytes or unicode, got 'float'
>>> etree.SubElement(child1, "proccount").text = len(psutil.pids())
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "lxml.etree.pyx", line 921, in lxml.etree._Element.text.__set__ (src/lxml/lxml.etree.c:41344)
 File "apihelpers.pxi", line 660, in lxml.etree._setNodeText (src/lxml/lxml.etree.c:18894)
 File "apihelpers.pxi", line 1333, in lxml.etree._utf8 (src/lxml/lxml.etree.c:24601)
 TypeError: Argument must be bytes or unicode, got 'int'

所以，这是我的 XML 打印出来的样子：

>>> print(etree.tostring(root, pretty_print=True))
<metrics>
  <basic>
    <name>mercury</name>
    <boottime/>
    <proccount/>
  </basic>
</metrics>

那么，有没有像我需要的那样将浮点数和整数推送到 xml 文本？还是我这样做完全错了？

感谢您的任何帮助，您可以提供。

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1 回答 1

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该text字段应为 unicode 或 str，而不是任何其他类型（boot_timeisfloat和len()is int）。所以只需将不符合字符串的元素转换为字符串：

# First system/hostname, so we know what machine this is
etree.SubElement(child1, "name").text = socket.gethostname() # nothing to do

# Then boot time, to get the time the system was booted.
etree.SubElement(child1, "boottime").text = str(psutil.boot_time())

# and process count, see how many processes are running.
etree.SubElement(child1, "proccount").text = str(len(psutil.pids()))

结果：

b'<metrics>\n  <basic>\n    <name>JOTD64</name>\n    <boottime>1473903558.0</boottime>\n    <proccount>121</proccount>\n  </basic>\n</metrics>\n'

我想图书馆可以进行isinstance(str,x)测试或str转换，但它不是这样设计的（如果你想用前导零显示你的浮点数，截断小数......）。如果 lib 假设一切都是str，它的运行速度会更快，大多数情况下都是如此。

于 2016-09-16T19:11:08.163 回答