新手问一个关于批量重命名指定目录下面所有文件的后缀名的程序问题

Glassy_sky

下面是我在网上看到的一个完整代码：
import os
import argparse


def batch_rename(work_dir, old_ext, new_ext):
    """
    This will batch rename a group of files in a given directory,
    once you pass the current and new extensions
    """
    # files = os.listdir(work_dir)
    for filename in os.listdir(work_dir):
        # Get the file extension
        split_file = os.path.splitext(filename)
        file_ext = split_file[1]
        # Start of the logic to check the file extensions, if old_ext = file_ext
        if old_ext == file_ext:
            # Returns changed name of the file with new extention
            newfile = split_file[0] + new_ext

            # Write the files
            os.rename(
                os.path.join(work_dir, filename),
                os.path.join(work_dir, newfile)
            )


def get_parser():
    parser = argparse.ArgumentParser(description='change extension of files in a working directory')
    parser.add_argument('work_dir',metavar='WORK_DIR', type=str, nargs=1,help='the directory where to change extension')
    parser.add_argument('old_ext',metavar='OLD_EXT', type=str, nargs=1, help='old extension')
    parser.add_argument('new_ext',metavar='NEW_EXT', type=str, nargs=1, help='new extension')
    return parser


def main():
    """
    This will be called if the script is directly invoked.
    """
    # adding command line argument
    parser = get_parser()
    args = vars(parser.parse_args())

    # Set the variable work_dir with the first argument passed
    work_dir = args['work_dir'][0]
    # Set the variable old_ext with the second argument passed
    old_ext = args['old_ext'][0]
    if old_ext[0] != '.':
        old_ext = '.' + old_ext
    # Set the variable new_ext with the third argument passed
    new_ext = args['new_ext'][0]
    if new_ext[0] != '.':
        new_ext = '.' + new_ext


    batch_rename(work_dir, old_ext, new_ext)
    work_dir = "/Users/Glassy Sky/Desktop/text/"
    old_ext = "pdf"
    new_ext = "docx"


if __name__ == '__main__':
    main()

运行时出现下面错误：
usage: text.py [-h] WORK_DIR OLD_EXT NEW_EXT
text.py: error: the following arguments are required: WORK_DIR, OLD_EXT, NEW_EXT

我看了好久都不知道哪里错了，期待路人大佬帮我指点一下

wp231957

应该是你调用错了   这个目测是需要输入命令行参数的

Glassy_sky

wp231957 发表于 2019-7-19 15:41
应该是你调用错了   这个目测是需要输入命令行参数的

那该怎么修改呢，求指点