After reading the doc entry for SimpleNamespace, I see running 'SimpleNamespace(**{0:0})' as a bug because doing so results in an object than contradicts the doc.

1. "A simple object subclass that provides attribute access to its namespace, as well as a meaningful repr. Unlike ... you can ... delete attributes."

But, after 'sn = SimpleNamespace(**{0:0})', sn.0 is a SyntaxError and getattr(sn, 0) raises 'TypeError: getattr(): attribute name must be string'.  As already noted, the 'attribute' does not appear in repr(sn).  'del sn.0' and 'delattr(sn, 0)' also fail.  If this is a feature, it is extremely buggy.

2. "The type is roughly equivalent to the following code:"

class SimpleNamespace:
    def __init__(self, **kwargs):
        self.__dict__.update(kwargs)

    def __repr__(self):
        keys = sorted(self.__dict__)
        items = ("{}={!r}".format(k, self.__dict__[k]) for k in keys)
        return "{}({})".format(type(self).__name__, ", ".join(items))

    def __eq__(self, other):
        return self.__dict__ == other.__dict__

With this definition, SimpleNamespace(**{0:0}) raises TypeError.  To me, running versus raising is outside the bounds of 'roughly equivalent'.