Function _showwarning

Lib/logging/__init__.py:2303–2321

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 re

(message, category, filename, lineno, file=None, line=None)

_warnings_showwarning = None

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:
        s = warnings.formatwarning(message, category, filename, lineno, line)
        logger = getLogger("py.warnings")
        if not logger.handlers:
            logger.addHandler(NullHandler())
        # bpo-46557: Log str(s) as msg instead of logger.warning("%s", s)
        # since some log aggregation tools group logs by the msg arg
        logger.warning(str(s))

def captureWarnings(capture):
    """