> Have you tried marking your string as unicode?

> msg = *u*'Não encontrado: %s' % web.ctx.path

> On Thursday, November 1, 2012 4:32:57 PM UTC+4, Carlos Alberto Costa
> Beppler wrote:

>> I´m having an very strange UnicodeDecodeError on the following program.

>> The most strange is that before start the application the same formatting
>> instruction works, it raises the error only inside the GET (or any other
>> controller method).

>> The test program is:
>> ==============================
>> #!/usr/bin/python
>> # -*- coding: utf-8 -*-

>> import os
>> import sys
>> import web

>> class Index(object):
>>     def GET(self, id = None):
>>         if id:
>>          # this raises UnicodeDecodeError
>>          msg = 'Não encontrado: %s' % web.ctx.path
>>          raise web.notfound(msg)
>>         return 'Encontrei'

>> urls = (
>>     '/(.*)', 'Index'
>> )

>> application = web.application(urls, globals())

>> # this works
>> msg = 'Não encontrado: %s' % '/test'
>> web.debug(msg)

>> if __name__=='__main__':
>>     application.run()
>> ==============================

>> The log message generated on server is:
>> ==============================
>> beppler@squeeze:~/site$ python test.py
>> 'N\xc3\xa3o encontrado: /test'
>> http://0.0.0.0:8080/
>> 'N\xc3\xa3o encontrado: /test'
>> Traceback (most recent call last):
>>   File "/home/beppler/Projects/elco/src/web/application.py", line 239, in
>> process
>>     return self.handle()
>>   File "/home/beppler/Projects/elco/src/web/application.py", line 230, in
>> handle
>>     return self._delegate(fn, self.fvars, args)
>>   File "/home/beppler/Projects/elco/src/web/application.py", line 462, in
>> _delegate
>>     return handle_class(cls)
>>   File "/home/beppler/Projects/elco/src/web/application.py", line 438, in
>> handle_class
>>     return tocall(*args)
>>   File "/home/beppler/Projects/elco/src/site/test.py", line 17, in GET
>>     msg = 'Não encontrado: %s' % web.ctx.path
>> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1:
>> ordinal not in range(128)
>> ==============================