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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_service_account_file(cls, filename, *args, **kwargs):
 """Creates an instance of this client using the provided credentials file. Args: filename (str):
 The path to the service account private key json file. args: Additional arguments to pass to the constructor. kwargs: Additional arguments to pass to the constructor. Returns: dialogflow_v2.SessionEntityTypesClient: The constructed client. """

        credentials = service_account.Credentials.from_service_account_file(
            filename)
        kwargs['credentials'] = credentials
        return cls(*args, **kwargs)