[issue13598] string.Formatter doesn't support empty curly braces "{}"

[Vinay Sajip]

Vinay Sajip <vinay_sajip at yahoo.co.uk> added the comment:

> Is there a reason "manual" is None, True, or False? Wouldn't just True or False suffice?

I suppose before we see the first bracketed form ({} or {\d+}) we don't know which it is.

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<http://bugs.python.org/issue13598>
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