Question

I have an xml file as follows:

<?xml version="1.0" encoding="utf-8"?>
  <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build" ToolsVersion="4.0">
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>

I want to add a line <Import Project="$(ProjectName).targets" /> between
</ImportGroup> and </Project> as follows

<?xml version="1.0" encoding="utf-8"?>
  <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build" ToolsVersion="4.0">
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
  <Import Project="$(ProjectName).targets" />
</Project>

If the line <Import Project="$(ProjectName).targets" /> already exists in file there is no need to add.

How can I do that?

Answer 1

Your question is based on lines in text files, but the input file is clearly XML, so assuming you actually want to add an Import if it doesn’t exist, try this:

import xml.dom.minidom

importstring = "$(Projectname).targets"
filename = "test.xml"

tree = xml.dom.minidom.parse(filename)
Project = tree.getElementsByTagName("Project")[0]

for Import in Project.getElementsByTagName("Import"):
    if Import.getAttribute("Project") == importstring:
        break
else: # note this is else belongs to the for, not the if
    newImport = xml.dom.minidom.Element("Import")
    newImport.setAttribute("Project", importstring)
    Project.appendChild(newImport)

tree.writexml(open(filename, 'w'))