vinay.sajip wrote:

+def _showwarning(message, category, filename, lineno, file=None, line=None):

• """
• Implementation of showwarnings which redirects to logging, which will first
• check to see if the file parameter is None. If a file is specified, it will
• delegate to the original warnings implementation of showwarning. Otherwise,
• it will call warnings.formatwarning and will log the resulting string to a
• warnings logger named "py.warnings" with level logging.WARNING.
• """
• if file is not None:

•    if _warnings_showwarning is not None:
  

•        _warnings_showwarning(message, category, filename, lineno, file, line)
  

• else:

•    import warnings
  

•    s = warnings.formatwarning(message, category, filename, lineno, line)
  

•    logger = getLogger("py.warnings")
  

•    if not logger.handlers:
  

•        logger.addHandler(NullHandler())
  

•    logger.warning("%s", s)
  

I'd be careful here - this could deadlock if a thread spawned as a side effect of importing a module happens to trigger a warning.

warnings is pulled into sys.modules as part of the interpreter startup - having a global "import warnings" shouldn't have any real effect on logging's import time.

Cheers, Nick.