Take dialects from syntax tree strings

[fgrunewald]

import ast
dialect_str = 'a, /, b, c=3, *, d, e=5'
input_str = f'def f({dialect_str}): pass'

tree = ast.parse(input_str)
# Disect the tree here to get to the juicy function object whose Signature we want

See PR #25

[pckroon]

Specifically, the idea is to format the dialect in the same format python functions define their arguments.
The easy and slightly terrifying solution would be eval(def f({dialect_str}): pass), with the user provided dialect_str (and then getting the function, and pulling out its signature). But then you're executing user provided code, which is always a bad idea.