Use getattr instead of _asdict/__getitem__

[tekknolagi]

_asdict is not public API for namedtuple.

You may want to consider using the built-in string module, which
implements this kind of .0/.foo formatting.

[coveralls]

Coverage decreased (-0.01%) to 99.184% when pulling c450567 on tekknolagi:main into 4bc5648 on noahmorrison:main.

[tekknolagi]

Oops, I forgot a test for changing behavior in this commit and you merged faster than I could amend my commit D: I'll file a subsequent PR.

[noahmorrison]

Ahh, thanks for catching that. That's obviously a much better way to handle it.

I'm not sure I understand your point about the string module?

[tekknolagi]

Kind of like this:

import string

class C:
    foo = "bar"

f = string.Formatter()
instance = C()
result = f.format("{0.foo}", instance)
assert result == "bar"

There's get_field and get_value, etc: https://docs.python.org/3.7/library/string.html#string.Formatter