def __getattr__(self, key):
    if (self._provider is None):
        raise AttributeError('Please run qlib.init() first using qlib')
    return getattr(self._provider, key)
def __getattr__(self, key):
    if (self._provider is None):
        raise AttributeError('Please run qlib.init() first using qlib')
    return getattr(self._provider, key)