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exarkun@charm:~$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52) 
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> int('0円', 256)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 256: '\x00'
>>> int('x', 256)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: int() base must be >= 2 and <= 36
>>> 
The former is misleading. \x00 is a perfectly valid byte if the base is
256. The real problem, that base 256 isn't supported, is obscured. It
would be much better for the latter case's message to be used in the
former case.