IronPython 中的 .Net 2.0 XML 读取器

Question

我写了一个XML读取器，它生成了一个格式很简单的列表，不过我这个脚本需要这样的格式。

import xml.etree.ElementTree as ET

PATH_IN = "<Path>\sweep.xml"

tree = ET.parse(PATH_IN)
root = tree.getroot()

Input = []
for project in root:

    for design in project:
        list_lvl2 = []
        list_lvl2.append(project.get('name'))
        list_lvl2.append(design.get('name'))
        list_lvl2.append('')

        list_lvl3 = [] 
        for param in design:
            list_lvl4 = []
            list_lvl4.append(param.get('name'))
            list_lvl5 = []
            for steps in param:
                list_lvl5.append(steps.text)
            list_lvl4.append(list_lvl5)
            list_lvl4.append(param.get('unit'))
            list_lvl3.append(list_lvl4)
        list_lvl2.append(list_lvl3)
        Input.append(list_lvl2)

问题是我必须在一个程序的脚本接口中运行它，这个程序使用的是IronPython 2.6.10920.0，基于.NET 2.0.50727.5466。而且它报了以下错误：

*Global - Messages
  [error] ImportException: No module named expat; use SimpleXMLTreeBuilder instead  In file "<Path>/sweep.py", line 36 ---- While executing script: <Path>/sweep.py
  [error] Error executing script in <Path>\sweep.py:
  [error] ImportException: No module named expat; use SimpleXMLTreeBuilder instead  In file "<Path>/sweep.py", line 36 ---- While executing script: <Path>/sweep.py
  [error] Error executing script in <Path>\sweep.py:

我不明白的是，使用同一个模块的另一个脚本却能正常工作：

import xml.etree.ElementTree as ET

path = "<Path>\projects.xml"

root = ET.Element('xml')
projects = oDesktop.GetProjectList()
for i in projects:
    project = ET.SubElement(root,'project')
    project.set('name', i)
    designs = oDesktop.SetActiveProject(i).GetTopDesignList()
    for u in designs:
        design = ET.SubElement(project,'design')
        design.set('name', u)
        vars = oDesktop.SetActiveProject(i).GetDesign(u).GetVariables()
        for z in vars:
            param = ET.SubElement(design,'param')
            param.set('name', z)
            value = ET.SubElement(param,'value')
            value.text = oDesktop.SetActiveProject(i).GetDesign(u).GetVariableValue(z)
f = open(path, "w")
tree = ET.ElementTree(root)
tree.write(f)

f.close()

oDesktop这些只是程序特定的函数，用来获取数据。我真的不明白为什么第一个脚本不行，我猜可能是因为.NET 2.0的原因。

更新：在查了一下expat是什么之后，我更加困惑了，因为我从来没有在任何地方用过它，而我使用的所有elementtree函数在这个版本的IronPython中应该都是支持的。尽管如此，在这一行 tree = ET.parse(PATH_IN) 还是给我报了expat的错误。

更新：我尝试使用 from elementtree import SimpleXMLTreeBuilder as ET，结果是：

*Global - Messages
  [error] ImportException: No module named elementtree  In file "<Path>/sweep.py", line 3 ---- While executing script: <Path>/sweep.py
  [error] Error executing script in <Path>\sweep.py:

error handling ironpython elementtree data retrieval xml parsing .net framework expat script interface

IronPython 中的 .Net 2.0 XML 读取器

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