将元组作为命令行参数传递 [英] Passing a tuple as command line argument

问题描述

我的要求是将元组作为命令行参数传递，如

My requirement is to pass a tuple as command line argument like

--data (1,2,3,4)

我尝试使用 argparse 模块，但是如果我像这样传递它，它会以字符串 '(1,2,3,4)' 的形式接收.我尝试为 argparse.add_argument 提供 type=tuple，但在这里没有用.

I tried to use the argparse module, but if I pass like this it is receiving as the string '(1,2,3,4)'. I tried by giving type=tuple for argparse.add_argument, but is of no use here.

我是否必须添加一个新的类型类并将其传递给 add_argument 的类型参数?

Do I have to add a new type class and pass that to type argument of add_argument?

更新

我根据答案尝试了 ast.literal_eval.感谢那.但它在结果中给出了空格，如下所示.

I tried the ast.literal_eval based on answers. Thanks for that. But it is giving spaces in the result as shown below.

(1,2,3,4)
<type 'str'>
(1, 2, 3, 4)
<type 'tuple'>

推荐答案

将 data 参数的 nargs 设置为 nargs="+"(意味着一个或多个)并输入int，然后您可以在命令行上像这样设置参数:

Set nargs of the data argument to nargs="+" (meaning one or more) and type to int, you can then set the arguments like this on the command line:

--data 1 2 3 4

args.data 现在将是 [1, 2, 3, 4] 的列表.

args.data will now be a list of [1, 2, 3, 4].

如果你必须有一个元组，你可以这样做:

If you must have a tuple, you can do:

my_tuple = tuple(args.data)

综合起来:

parser = argparse.ArgumentParser()
parser.add_argument('--data', nargs='+', type=int)
args = parser.parse_args()
my_tuple = tuple(args.data)

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