_twisted.py 文件源码

def show_warning_via_twisted(
        message, category, filename, lineno, file=None, line=None):
    """Replacement for `warnings.showwarning` that logs via Twisted."""
    if file is None:
        # Try to find a module name with which to log this warning.
        module = get_module_for_file(filename)
        logger = twistedModern.Logger(
            "global" if module is None else module.__name__)
        # `message` is/can be an instance of `category`, so stringify.
        logger.warn(
            "{category}: {message}", message=str(message),
            category=category.__qualname__, filename=filename,
            lineno=lineno, line=line)
    else:
        # It's not clear why and when `file` will be specified, but try to
        # honour the intention.
        warning = warnings.formatwarning(
            message, category, filename, lineno, line)
        try:
            file.write(warning)
            file.flush()
        except OSError:
            pass  # We tried.


# Those levels for which we should emit log events.