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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 start_plugin(file_path=None):
 """This function initialize the Ocean plugin"""

    if os.getenv('CONFIG_PATH'):
        file_path = os.getenv('CONFIG_PATH')
    else:
        file_path = file_path
    if file_path is not None:
        config = parse_config(file_path)
        plugin_instance = load_plugin(config)
    else:
        plugin_instance = load_plugin
    return plugin_instance