argparse长选项的单破折号 [英] Single dash for argparse long options

问题描述

是否可以使用argparse将--longoption表示为-longoption?

Is it possible to make it so that --longoption is represented as -longoption using argparse?

argparse.prefix_chars 无效，因为它假定前缀char将在长选项中重复.

argparse.prefix_chars doesn't work, as it is assumed that the prefix char would be repeated for a long option.

我在想，也许有一种方法可以关闭短选项，并允许长选项使用单破折号而不是双破折号.像这样:

I'm thinking perhaps there is a way to turn off short options and allow long options to use a single dash instead of a double dash. Something like this:

parser = argparse.ArgumentParser()
parser.turn_off_short_opts()

可以做到吗?如果没有，我该怎么用呢?

Can this be done? If not, what can I use to accomplish this?

推荐答案

单破折号长参数不是问题:

Single dash long arguments aren't a problem:

In [250]: p=argparse.ArgumentParser()

In [251]: p.add_argument('-longargument')
Out[251]: _StoreAction(option_strings=['-longargument'], dest='longargument', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)

In [252]: p.parse_args(['-long','test'])
Out[252]: Namespace(longargument='test')

In [253]: p.parse_args(['-l','test'])
Out[253]: Namespace(longargument='test')

我必须仔细检查代码，但我认为多头和空头选项之间的区别不那么明显.创建动作时，所有动作均添加到option_strings属性中.长字符串(多字符)用于设置目标"，但您也可以自己设置.

I'd have to double check the code, but I don't think the distinction between long and short options is that significant. When creating the action, all are added to the option_strings attribute. The long (multicharacter) string is used to set the 'dest', but you can also set that yourself.

Duffy引用的行为:longoption means a completely different thing: It means -l -o -n -g -p -t -i更细微.如果-l，-o等都已定义并且不需要参数，它将使用解释.但这不会干扰-longoption的常规解释.但是您应该意识到这种解释，并在开发过程中进行测试.

The behavior that Duffy cites: longoption means a completely different thing: It means -l -o -n -g -p -t -i is more nuanced. If -l,-o, etc are all defined and don't require arguments it will use interpretation. But it doesn't interfer with regular interpretation of -longoption. But you should be aware of such interpretations, and test things during development.

以下是用于为可选选项设置dest的代码:

Here's the code used to set the dest for optionals:

    if dest is None:
        if long_option_strings:
            dest_option_string = long_option_strings[0]
        else:
            dest_option_string = option_strings[0]

就在此之前，它使用--将字符串收集到long_option_string`列表中.但是，如果没有这样的字符串，它将使用第一个字符串.

just before this it collected the strings with -- into the long_option_string` list. But if there isn't such a string, it uses the first string.

In [270]: p.add_argument('-longargument','-l','--longish')
Out[270]: _StoreAction(option_strings=['-longargument', '-l', '--longish'], dest='longish', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)

此处使用--longish代替-longargument.

查看选项字符串长度的唯一其他地方是-xyz的特殊处理，该处理着重于单个字符串('-x'，'-y'，'-z').

The only other place that looks at option string length is the special handling of the -xyz, which focuses on the single character strings ('-x', '-y', '-z').

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