logger unicode vs utf8 receipe just actually for python2

logger_patch.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

__author__ = "maverick"


def monkey_patch():
  """
  Импортируем модуль logger_monkey_patch и вызываем logger_patch.monkey_patch()
  Происходит подмена метода emit в StreamHandler и решается проблема:

  UnicodeEncodeError: 'ascii' codec can't encode characters in position 4-12: ordinal not in range(128)

  такого типа строка корректно логируется:
  import Codecs
  _unicode = Codecs()._unicode
  self.__logger.debug("%sKey:%s - Value:%s", ident, _unicode(str(key)), _unicode(str(value)))

  Если в левой части лог строки (там где Key и Value будут русские символы),
  то не забываем символ 'u' перед строкой:
  self.__logger.debug(u"%sKey:%s - Value:%s", ident, _unicode(str(key)), _unicode(str(value)))
  """

  def emit(self, record):
    """
    Патченная версия emit метода, для решения граблем с ascii encoding/decoding
    на момент логирования объектов имеющих смесь локальных и английских символов и
    при этом испорльзуется  оператор % для сложения строк (внутри StreamHandler)

    Emit a record.

    If a formatter is specified, it is used to format the record.
    The record is then written to the stream with a trailing newline.  If
    exception information is present, it is formatted using
    traceback.print_exception and appended to the stream.  If the stream
    has an 'encoding' attribute, it is used to determine how to do the
    output to the stream.
    """

    try:
      msg = self.format(record)
      stream = self.stream
      if _unicode:
        fs = u"%s\n"
      else:
        fs = "%s\n"
      if not _unicode: #if no unicode support...
        stream.write(fs % msg)
      else:
        try:
          if (isinstance(msg, unicode) and getattr(stream, "encoding", None)):
            ufs = fs.decode(stream.encoding)
            try:
              stream.write(ufs % msg)
            except UnicodeEncodeError:
              # Printing to terminals sometimes fails. For example,
              # with an encoding of 'cp1251', the above write will
              # work if written to a stream opened or wrapped by
              # the codecs module, but fail when writing to a
              # terminal even when the codepage is set to cp1251.
              # An extra encoding step seems to be needed.
              stream.write((ufs % msg).encode(stream.encoding))
          else:
            stream.write(fs % msg)
        except UnicodeError:
          stream.write(fs % msg.decode("UTF-8"))
      self.flush()
    except (KeyboardInterrupt, SystemExit):
      raise
    except:
      self.handleError(record)

  try:
    _logging = __import__("logging")
    _unicode = _logging._unicode
    _logging.StreamHandler.emit = emit
  except Exception:
    # скрытие исключение не ошибка - фича!
    return