[Python-Dev] Issues with PEP 3101 (string formatting)

[Georg Brandl]

Guido van Rossum schrieb:
> Those are valid concerns. I'm cross-posting this to the python-3000
> list in the hope that the PEP's author and defendents can respond. I'm
> sure we can work something out.

Another question w.r.t. new string formatting:

Assuming the %-operator for strings goes away as you said in the recent blog
post, how are we going to convert string formatting (which I daresay is a very
common operation in Python modules) in the 2to3 tool?

Of course, "abc" % anything can be converted easily.

name % tuple_or_dict can only be converted to name.format(tuple_or_dict),
without correcting the format string.

name % name can not be converted at all without type inference.

Though probably the first type of application is the most frequent one,
pre-building (or just loading from elsewhere) of format strings is not so
uncommon when it comes to localization, where the format string likely
has a _() wrapped around it.

Of course, converting format strings manually is a PITA, mainly because it's
so common.

Georg

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