On 14/01/2014 19:56, Ethan Furman wrote:
Duh. Here's the text, as well. ;)
%s, because it is the most general, has the most convoluted resolution:
- input type is bytes?
pass it straight through
- input type is numeric?
use its __xxx__ [1] [2] method and ascii-encode it (strictly)
- input type is something else?
use its __bytes__ method; if there isn't one, raise an exception [3]
Examples:
>>> b'%s' % b'abc'
b'abc'
>>> b'%s' % 3.14
b'3.14'
>>> b'%s' % 'hello world!'
Traceback (most recent call last):
...
TypeError: 'hello world' has no __bytes__ method, perhaps you need
to encode it?
For completeness I believe %r and %a should be included here as well.
FTR %a appears to have been introduced in 3.2, but I couldn't find
anything in the What's New and there's no note in the docs
http://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting
to indicate when it first came into play.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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