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Tue Aug 24 15:57:18 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-August/048310.html

An improvement to logging has been proposed by Miki
Tebeka, which involves the creation of file-like
wrapper objects for loggers. This makes it possible to
use the print idiom for logging:

import logging

logging.basicConfig()
logger = logging.getLogger("my.app")
err = logger.getFileObject(logging.ERROR)
dbg = logger.getFileObject(logging.DEBUG)
...

print >> err, "My logging message with %s" %
"arguments"
print >> dbg, "A message at %s level" % "debug"

Miki has helpfully sent in a patch (#1001864), and I
propose to check it in by the 27th of August. I just
wanted to get comments from python-dev first. There's
one wart in the implementation - to avoid printing out
blank lines caused by the "\n" appended by print, we
ignore messages which are == "\n". This works only
because print does a separate write for the "\n". Can
anyone see a problem with this approach?

class LoggerFileObject:
    """
    Simulate a file object for a given logging level.
    """
    def __init__(self, logger, level):
        """
        Initialize file object with logger and level
        """
        self.logger = logger
        self.level = level
        self.closed = 0

    def write(self, msg):
        """
        Write message to log.
        """
        if self.closed:
            raise ValueError("I/O operation on closed
file")
        # Avoid printing blank lines.
        if msg != "\n":
            self.logger.log(self.level, msg)

    def flush(self):
        """
        Flush the file object. This flushes the
logger's handlers.
        """
        if self.closed:
            return
        for handler in self.logger.handlers:
            handler.flush()

    def close(self):
        """
        Close file object.

        Calling "write" after "close" will raise a
ValueError.
        """
        self.closed = 1

Regards,

Vinay

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[Python-Dev] Proposed change to logging