implement ast module, or a least its `literal_eval`

Hello,

while trying to import jinja2 for testing purpose, the import of literal_eval from ast module from stdlib failed. literal_eval is a safe eval which can be used with untrusted source (see https://docs.python.org/3/library/ast.html#ast.literal_eval) and could be useful in the web context. Would it be possible to implement ast module, or at least its literal_eval method?

Thanks

[gilch]

I hacked together a (mostly) working literal_eval from pycopy-ast and CPython 3.6.

https://gist.github.com/gilch/efdd9a1f600cef976be921bb3c5ed421

[moepnse]

I am currently working on porting the AST module of the pycopy-lib and RestrictedPython to Brython.