创建(主)解析器 ArgumentParser 对象 功能: * 1.add_argument() 添加参数(positional, optional) * 2.print_help() 返回帮助信息 * 3.传入无效参数进行报错 * 4.parse_args() 解析输入的参数(只有主 parser 包含) * 5.add_subparsers() 返回子命令解析对象 功能: * add_parser() 添加子解析器(支持功能 1、2、3),多个子解析器互斥 * set_defaults() * 多个子解析器互斥
haiguanplayer/argparse
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