def warn_with_traceback(message, category, filename, lineno, file=None, line=None):
    log = (file if hasattr(file, 'write') else sys.stderr)
    traceback.print_stack(file=log)
    log.write(warnings.formatwarning(message, category, filename, lineno, line))
def warn_with_traceback(message, category, filename, lineno, file=None, line=None):
    log = (file if hasattr(file, 'write') else sys.stderr)
    traceback.print_stack(file=log)
    log.write(warnings.formatwarning(message, category, filename, lineno, line))