[Python-Dev] PEP 461 Final?
Glenn Linderman
v+python at g.nevcal.com
Fri Jan 17 20:40:37 CET 2014
On 1/17/2014 8:49 AM, Ethan Furman wrote:
> %s is restricted in what it will accept::
>
> - input type supports Py_buffer?
> use it to collect the necessary bytes
>
> - input type is something else?
> use its __bytes__ method; if there isn't one, raise a TypeError
>
> Examples:
>
> >>> b'%s' % b'abc'
> b'abc'
>
> >>> b'%s' % 3.14
> Traceback (most recent call last):
> ...
> TypeError: 3.14 has no __bytes__ method
>
> >>> b'%s' % 'hello world!'
> Traceback (most recent call last):
> ...
> TypeError: 'hello world' has no __bytes__ method, perhaps you need
> to encode it?
If you produce a helpful error message for str (re: encoding), might it
not be appropriate to produce a helpful error message for builtin number
types (, perhaps you need a numeric format code?)?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20140117/1a1b8955/attachment.html>
More information about the Python-Dev
mailing list