Getting and modifying generator module sources
All these sources (and the Acceleo ones) are stored on the Subversion repository of the project. You may directly use this repository but some modules provide a quicker and easier way to get the sources directly from Eclipse. This uses the Team Project Set files.
If the module you want to modify provides such a file, download it and keep it in arm's reach. Here we'll use the file provided by the Ecore2Python module.
Your Eclipse installation should have a Subversion support to use these files, you may use either the Subversive or Subclipse plugin (the PSF files available from Acceleo.org are only compatibles with Subversive plugin).
The Eclipse bundles provided by the Acceleo project all include Subversive.
Start Eclipse. As yet the workspace is empty.
Choose the File -> Import... -> action from the menu.
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Choose Team Project Set then click on Next.
You should now specify which file to import, here it's Ecore2Python-projectSet.psf. This file can be downloaded from the corresponding module web page.
Once the file is selected click on Finish.
The Eclipse projects are automatically imported in the current workspace, you may now start modifying the templates!