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> def __init__(self, command, *, **callkwds):
Is the '*' marker needed?
> self.callkwds = callkwds
These aren’t used in the module-level functions. What is the use case?
If you forgive me for the nitpick, the docstrings have too much indenting.
> a "*.py" value interpolated with "{!u}" should indeed pick up all of those files,
> since the wildcard will be passed unmodified to the underlying shell
Great.
(This patch will also serve as a nice example of creating a string formatter. I’ve seen the PyCon video about them, but I thought I was missing a piece since I didn’t see how you hook the format function to your custom formatter; it looks like the answer is that you don’t.)