Michal Kwiatkowski wrote:
Hi, I'm working on Pythoscope[1], a unit test generator for Python and stumbled into the following problem. I need a way to analyze and modify Python AST tree, but without loosing source code formatting and comments. Standard library ast module discards those, so I started looking for other solutions. I found a library used by the 2to3 script[2], which does different kinds of source code refactorings and preserves the formatting of the original file. Sadly AST generated by this library is not compatible with the standard one, so I can't use a nice interface of compiler.visitor[3]. It isn't also as well documented. I kind of liked the clean and descriptive list of standard AST nodes[4]. So here are my questions to the list. Is there any library built on top of lib2to3 which makes traversing it easier? The pattern matcher is nice, but not always feasible for the higher level view of the source code. Are there any tutorials/documentation about usage of lib2to3 which I'm not aware of? I basically read through HACKING, README and a lot of source code, but would appreciate some more examples and insights. Is the lib2to3 library meant to be used outside of the 2to3 script or rather not? Are there any projects that will incorporate its features (enriched AST in particular) in a more "official" library-like package? Will lib2to3 be put on PyPI anytime? [1] http://pythoscope.org/ [2] http://svn.python.org/view/sandbox/trunk/2to3/ [3] http://docs.python.org/lib/module-compiler.visitor.html [4] http://docs.python.org/lib/module-compiler.ast.html
You found the appropriate library, but I am unaware of anything that you missed. I think others have had the idea that 2to3 might grow into something more, but the core developers are currently focues on getting 2.6/3.0 out by the end of September.
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