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Transforms Python source code into an abstract syntax tree (AST)
defined in the ast module.

The simplest ways to invoke this module are via parse and parseFile.
parse(buf) -> AST
parseFile(path) -> AST
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    Exposes the following methods:
        tree = transform(ast_tree)
        tree = parsesuite(text)
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        tree = parsefile(fileob | filename)
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