On Sun, Jan 12, 2014 at 9:18 PM, Guido van Rossum <guido at python.org> wrote: > On Sun, Jan 12, 2014 at 6:07 PM, Daniel Holth <dholth at gmail.com> wrote: >> Is there a formatting character that means "anything except a unicode >> string" to prevent accidentally interpolating a Unicode string into a >> bytes string without [a sane] encoding? > > No, and we shouldn't introduce one. An operation should either work > for no type, one type, a few specific types, or all types. Something > that works for all but one type will *appear* to work for all types to > a casually experimenting user and may pass extensive unittests, > leaving a bomb that can detonate when you least expect it. That pretty much describes how I feel about str(bytes). I would accept "only a bytes" or "only a string" as consolation formatting characters :-)
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