There's more to changing Python's grammar than editing
Grammar/Grammar and Python/compile.c. This PEP aims to be a
checklist of places that must also be fixed.
It is probably incomplete. If you see omissions, just add them if
you can -- you are not going to offend the author's sense of
ownership. Otherwise submit a bug or patch and assign it to mwh.
This PEP is not intended to be an instruction manual on Python
grammar hacking, for several reasons.
People are getting this wrong all the time; it took well over a
year before someone noticed that adding the floor division
operator (//) broke the parser module.
__ Grammar/Grammar: OK, you'd probably worked this one out :)
__ Python/compile.c: you'll most likely need to edit both the
actual compiler and the symtable builder (which is to say both
the com_foo and the sym_foo functions).
__ You may need to regenerate Lib/symbol.py and/or Lib/token.py.
__ The parser module. Add some of your new syntax to test_parser,
bang on parsermodule.c until it passes.
__ The compiler package. A good test is to compile the standard
library and test suite with the compiler package and then check
it runs. You did add some of your new syntax to the test
suite, didn't you? There's a script in Tools/compiler that
__ If you've gone so far as to change the token structure of
Python, then the tokenizer library module will need to be
__ Certain changes may require tweaks to the library module
__ Jython too will need work, but I don't know what. Explanations
__ Documentation must be written!
 SF Bug #676521, parser module validation failure
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