我正在尝试在
python中使用argparse库来读取可选和必需的参数.到目前为止我这样做：
import argparse
parser = argparse.ArgumentParser(description='Cleanup Script for Folder')
parser.add_argument('PATH_TO_WORKDIR_ROOT', type=str, dest='PATH_TO_WORKDIR_ROOT', action='store', help='(absolute or) relative path to directory \n to work on, e.g. "..\MyFolder\\"')
parser.add_argument('--PATH_TO_BACKUP_ROOT', type=str, dest='PATH_TO_BACKUP_ROOT', action='store', help='(absolute or) relative path to Backup-Directory \n default is ".\BACKUP\"')
args = parser.parse_args()
现在我正在测试我的代码,它给了我一个我不理解的值错误：
$python argparsetest.py --help
Traceback (most recent call last):
File "argparsetest.py", line 5, in
parser.add_argument('PATH_TO_WORKDIR_ROOT', type=str, dest='PATH_TO_WORKDIR_ ROOT', action='store', help='(absolute or)
relative path to directory \n to wo rk on, e.g. "..\MyFolder\\"')
File "C:\Program
Files\Enthought\Canopy\App\appdata\canopy-1.3.0.1715.win-x86_
64\lib\argparse.py", line 1262, in add_argument
raise ValueError('dest supplied twice for positional argument') ValueError: dest supplied twice for positional argument
只有一个位置参数,不存在且目的地不同.我真的不明白麻烦:)
非常感谢提前！
