Eric V. Smith <[email protected]> added the comment:
The intermingling of character data and markup is far from irrelevant: that's
exactly what str.format() does! I don't see how it can be irrelevant to a
discussion of how the string is parsed.
Note that there are no restrictions, in general, on what's in a format
specifier. Braces can be in format specifiers, if they make sense for that
type. For example:
>>> from datetime import datetime
>>> format(datetime.now(), '{}%Y-%m-%d}{')
'{}2011-06-03}{'
It's definitely true that you can have valid format specifiers that cannot be
represented in strings parsed by str.format(). The PEP talks about both format
specifiers in the abstract (stand alone) and format specifiers contained in
str.format() strings.
The current implementation of str.format() finds matched pairs of braces and
call what's inside "markup", then parse that markup. This indeed restricts
what's inside the markup. I believe the implementation is compliant with the
PEP.
It's also true that other interpretations of the PEP are possible. I'm just not
sure the benefit to be gained justifies changing all of the extant str.format()
implementations, in addition to explaining the different behavior.
Many useful features for str.format() were rejected in order to keep the
implementation and documentation simple.
I'm not saying change and improvement is impossible. I'm just not convinced
it's worthwhile.
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