# coding=utf-8
import logging

logger = logging.getLogger(u'测试')
logger.error(u'测试')

# these code will get an unexpected error
# because getLogger encode the unicode to utf-8 while _log don't
# see line 474 in logging/__init__.py
# my suggestion is to keep the encoding in logging same with python2 with unicode

I cannot reproduce, see below. Which exact version of Python are you using, and on what platform, and with what locale?

$ more logtest9.py
# coding=utf-8
import logging

logger = logging.getLogger(u'测试')
logger.error(u'测试')
$ python2.7 logtest9.py 
No handlers could be found for logger "测试"

sorry, i forgot this:

logging.basicConfig(format='%(name)s %(message)s')

the error raised at the processing of the format while the name is 'utf-8' encoded and the message is an unicode

here is the case, sorry again for just typing it before and not testing it myself :)


# coding=utf-8
import logging

logging.basicConfig(format='%(name)s %(message)s')

logger = logging.getLogger(u'测试')
logger.error(u'测试')


btw, i'm using python2.7.10, mac osx 10.11, but i think this can effect all python2

$ cat x.py 
# coding=utf-8
import logging
logging.basicConfig(format='%(name)s %(message)s')
logger = logging.getLogger(u'测试')
logger.error(u'测试')

$ python2.7 x.py 
Traceback (most recent call last):
  File "/usr/lib64/python2.7/logging/__init__.py", line 859, in emit
    msg = self.format(record)
  File "/usr/lib64/python2.7/logging/__init__.py", line 732, in format
    return fmt.format(record)
  File "/usr/lib64/python2.7/logging/__init__.py", line 474, in format
    s = self._fmt % record.__dict__
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 0: ordinal not in range(128)
Logged from file x.py, line 8

The problem is that logger names which are Unicode are not handled correctly, leading to the error.

New changeset 512a628c683e by Vinay Sajip in branch '2.7':
Closes #25664: handled logger names in Unicode.
https://hg.python.org/cpython/rev/512a628c683e

> New changeset 512a628c683e by Vinay Sajip in branch '2.7':
> Closes #25664: handled logger names in Unicode.
> https://hg.python.org/cpython/rev/512a628c683e

.format() doesn't look to me like the best place to encode the name. Why not doing that in record constructor?

I don't want to add one try/except for each record field :-/

> Why not doing that in record constructor?

You're right, that's probably better. Perhaps I was too hasty ...