How to use the telegraph.exceptions.TelegraphException function in telegraph

:param f: filename or file-like object.
    :type f: file, str or list
    """
    with FilesOpener(f) as files:
        response = requests.post(
            'https://telegra.ph/upload',
            files=files
        ).json()

    if isinstance(response, list):
        error = response[0].get('error')
    else:
        error = response.get('error')

    if error:
        raise TelegraphException(error)

    return [i['src'] for i in response]

def method(self, method, values=None, path=''):
        values = values.copy() if values is not None else {}

        if 'access_token' not in values and self.access_token:
            values['access_token'] = self.access_token

        response = self.session.post(
            'https://api.telegra.ph/{}/{}'.format(method, path),
            values
        ).json()

        if response.get('ok'):
            return response['result']

        raise TelegraphException(response.get('error'))