[Python-Dev] Policy for making changes to the AST (original) (raw)

Terry Reedy tjreedy at udel.edu
Mon Apr 4 18:19:15 CEST 2011

On 4/3/2011 10:02 PM, Guido van Rossum wrote:

Sure, but do we have any indication that the warnings for dis make a difference?

I think there had been a few grumbles about bytecode not being stable. Without that, it is part of the newish effort to specify in the docs what is CPython specific. In http://bugs.python.org/issue11762 I propose a lighter version of the dis notice:

"CPython implementation detail: The ast definition is specific to the CPython interpreter! Ast nodes may be added, removed, or changed between versions. Use ast.version to work across versions."

and that ast.version get a normal formal entry

ast.version String constant with version number of the abstract grammar file. 3.1: '67616'; 3.2: '82163'; 3.3: 'xxxxxxxxx'

-- Terry Jan Reedy

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