def recognize_google(self, audio_data, key = None, language = "en-US", show_all = False):
        """
        Performs speech recognition on ``audio_data`` (an ``AudioData`` instance), using the Google Speech Recognition API.

        The Google Speech Recognition API key is specified by ``key``. If not specified, it uses a generic key that works out of the box. This should generally be used for personal or testing purposes only, as it **may be revoked by Google at any time**.

        To obtain your own API key, simply following the steps on the `API Keys <http://www.chromium.org/developers/how-tos/api-keys>`__ page at the Chromium Developers site. In the Google Developers Console, Google Speech Recognition is listed as "Speech API".

        The recognition language is determined by ``language``, an RFC5646 language tag like ``"en-US"`` (US English) or ``"fr-FR"`` (International French), defaulting to US English. A list of supported language values can be found in this `StackOverflow answer <http://stackoverflow.com/a/14302134>`__.

        Returns the most likely transcription if ``show_all`` is false (the default). Otherwise, returns the raw API response as a JSON dictionary.

        Raises a ``speech_recognition.UnknownValueError`` exception if the speech is unintelligible. Raises a ``speech_recognition.RequestError`` exception if the speech recognition operation failed, if the key isn't valid, or if there is no internet connection.
        """
        assert isinstance(audio_data, AudioData), "`audio_data` must be audio data"
        assert key is None or isinstance(key, str), "`key` must be `None` or a string"
        assert isinstance(language, str), "`language` must be a string"

        flac_data = audio_data.get_flac_data(
            convert_rate = None if audio_data.sample_rate >= 8000 else 8000, # audio samples must be at least 8 kHz
            convert_width = None if audio_data.sample_width >= 2 else 2 # audio samples must be at least 16-bit
        )
        if key is None: key = "AIzaSyBOti4mM-6x9WDnZIjIeyEU21OpBXqWBgw"
        url = "http://www.google.com/speech-api/v2/recognize?{0}".format(urlencode({
            "client": "chromium",
            "lang": language,
            "key": key,
        }))
        request = Request(url, data = flac_data, headers = {"Content-Type": "audio/x-flac; rate={0}".format(audio_data.sample_rate)})

        # obtain audio transcription results
        try:
            response = urlopen(request)
        except __HOLE__ as e:
            raise RequestError("recognition request failed: {0}".format(getattr(e, "reason", "status {0}".format(e.code)))) # use getattr to be compatible with Python 2.6
        except URLError as e:
            raise RequestError("recognition connection failed: {0}".format(e.reason))
        response_text = response.read().decode("utf-8")

        # ignore any blank blocks
        actual_result = []
        for line in response_text.split("\n"):
            if not line: continue
            result = json.loads(line)["result"]
            if len(result) != 0:
                actual_result = result[0]
                break

        # return results
        if show_all: return actual_result
        if "alternative" not in actual_result: raise UnknownValueError()
        for entry in actual_result["alternative"]:
            if "transcript" in entry:
                return entry["transcript"]
        raise UnknownValueError() # no transcriptions available
dataset/ETHPy150Open Uberi/speech_recognition/speech_recognition/__init__.py/Recognizer.recognize_google