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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 create_file_service(self):
        '''
        Creates a FileService object with the settings specified in the 
        CloudStorageAccount.

        :return: A service object.
        :rtype: :class:`~azure.storage.file.fileservice.FileService`
        '''
        try:
            from azure.storage.file.fileservice import FileService
            return FileService(self.account_name, self.account_key,
                               sas_token=self.sas_token,
                               endpoint_suffix=self.endpoint_suffix)
        except ImportError:
            raise Exception('The package azure-storage-file is required. '
                            + 'Please install it using "pip install azure-storage-file"')