import io, _pyio

obs = {name : getattr(_pyio, name) for name in _pyio.__all__}
classes = {name : ob for name, ob in obs.items() if isinstance(ob, type)}

not_api = {'__weakref__',
           '__dict__',
           '__del__',
           '__module__',
           '__abstractmethods__'}
def valid_api_name(s):
    return (not s.startswith('_')
            or s.endswith('__') and s not in not_api)

for name, cls in classes.items():
    ccls = getattr(io, name)
    missing = set(dir(cls)) - set(dir(ccls))
    missing = [s for s in missing if valid_api_name(s)]
    if missing:
        print(name, 'C is missing:', missing)
    missing = set(dir(ccls)) - set(dir(cls))
    missing = [s for s in missing if valid_api_name(s)]
    if missing:
        print(name, 'python is missing:', missing)