- Create a custom search engine here: https://programmablesearchengine.google.com/.
    - In `What to search` to search, pick the `Search the entire Web` option.
    After search engine is created, you can click on it and find `Search engine ID`
      on the Overview page.
    """
    search_engine: Any  #: :meta private:
    google_api_key: Optional[str] = None
    google_cse_id: Optional[str] = None
    k: int = 10
    siterestrict: bool = False
    class Config:
        """Configuration for this pydantic object."""
        extra = Extra.forbid
    def _google_search_results(self, search_term: str, **kwargs: Any) -> List[dict]:
        cse = self.search_engine.cse()
        if self.siterestrict:
            cse = cse.siterestrict()
        res = cse.list(q=search_term, cx=self.google_cse_id, **kwargs).execute()
        return res.get("items", [])
    @root_validator()
    def validate_environment(cls, values: Dict) -> Dict:
        """Validate that api key and python package exists in environment."""
        google_api_key = get_from_dict_or_env(
            values, "google_api_key", "GOOGLE_API_KEY"
        )
        values["google_api_key"] = google_api_key
        google_cse_id = get_from_dict_or_env(values, "google_cse_id", "GOOGLE_CSE_ID")
        values["google_cse_id"] = google_cse_id
        try:
            from googleapiclient.discovery import build
        except ImportError:
            raise ImportError(
                "google-api-python-client is not installed. "