我们所做的就是为文件管理器程序添加一组参数。请注意，所有这些参数都是可选参数。因此，我们使用一些if-elif语句来匹配命令行输入和正确的参数类型函数，以便可以处理查询。

以下是一些描述上述程序用法的代码：

# renaming

os.rename(old_filename, new_filename)

print("Successfully renamed {} to {}.".format(old_filename, new_filename))

def main():

# create parser object

parser = argparse.ArgumentParser(description = "A text file manager!")

# defining arguments for parser object

parser.add_argument("-r", "--read", type = str, nargs = 1,

metavar = "file_name", default = None,

help = "Opens and reads the specified text file.")

parser.add_argument("-s", "--show", type = str, nargs = 1,

metavar = "path", default = None,

help = "Shows all the text files on specified directory path.\

Type '.' for current directory.")

parser.add_argument("-d", "--delete", type = str, nargs = 1,

metavar = "file_name", default = None,

help = "Deletes the specified text file.")

parser.add_argument("-c", "--copy", type = str, nargs = 2,

metavar = ('file1','file2'), help = "Copy file1 contents to \

file2 Warning: file2 will get overwritten.")

parser.add_argument("--rename", type = str, nargs = 2,

metavar = ('old_name','new_name'),

help = "Renames the specified file to a new name.")

# parse the arguments from standard input

args = parser.parse_args()

# calling functions depending on type of argument

if args.read != None:

read(args)

elif args.show != None:

show(args)

elif args.delete !=None:

delete(args)

elif args.copy != None:

copy(args)

elif args.rename != None:

rename(args)

if __name__ == "__main__":

# calling the main function

main()