def _collectWarnings(observeWarning, f, *args, **kwargs):
    def showWarning(message, category, filename, lineno, file=None, line=None):
        assert isinstance(message, Warning)
        observeWarning(_Warning(
                message.args[0], category, filename, lineno))

    # Disable the per-module cache for every module otherwise if the warning
    # which the caller is expecting us to collect was already emitted it won't
    # be re-emitted by the call to f which happens below.
    for v in sys.modules.itervalues():
        if v is not None:
            try:
                v.__warningregistry__ = None
            except:
                # Don't specify a particular exception type to handle in case
                # some wacky object raises some wacky exception in response to
                # the setattr attempt.
                pass

    origFilters = warnings.filters[:]
    origShow = warnings.showwarning
    warnings.simplefilter('always')
    try:
        warnings.showwarning = showWarning
        result = f(*args, **kwargs)
    finally:
        warnings.filters[:] = origFilters
        warnings.showwarning = origShow
    return result
Call C{f} with C{args} positional arguments and C{kwargs} keyword arguments
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/trial/unittest.py/_collectWarnings