How to use the kaggle.api_client.ApiClient function in kaggle

if self.CONFIG_NAME_PROXY in config_data:
            configuration.proxy = config_data[self.CONFIG_NAME_PROXY]

        # Cert File

        if self.CONFIG_NAME_SSL_CA_CERT in config_data:
            configuration.ssl_ca_cert = config_data[
                self.CONFIG_NAME_SSL_CA_CERT]

        # Keep config values with class instance, and load api client!

        self.config_values = config_data

        try:
            self.api_client = ApiClient(configuration)

        except Exception as error:

            if 'Proxy' in type(error).__name__:
                raise ValueError(
                    'The specified proxy ' +
                    config_data[self.CONFIG_NAME_PROXY] +
                    ' is not valid, please check your proxy settings')
            else:
                raise ValueError(
                    'Unauthorized: you must download an API key or export '
                    'credentials to the environment. Please see\n ' +
                    'https://github.com/Kaggle/kaggle-api#api-credentials ' +
                    'for instructions.')

def __init__(self, api_client=None):
        if api_client is None:
            api_client = ApiClient()
        self.api_client = api_client