Larry Hastings added the comment:
For what it's worth, here's what we're doing. The new Argument Clinic
"parameter" line looks a great deal like the middle bit of a Python function
declaration. So much so that we can do this:
ast_string = "def x({}): pass".format(parameter_line)
root = ast.parse(ast_string)
We then walk the node tree and pull out what we need. We do a similar trick to
parse the return converter, which comes from another line. ("def x() {}: pass")
The "converter function" can look like a literal string, an id, or a function
call. When we see the function call form, we pull out each keyword and its
value, then pass the value node to ast.literal_eval(). Easy peasy and Bob's
your uncle.
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<http://bugs.python.org/issue17490>
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