novaBBS - comp.lang.python - Add angle brackets for required args in argparse

Add angle brackets for required args in argparse

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Subject: Add angle brackets for required args in argparse
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by: scruel tao - Wed, 15 Feb 2023 07:33 UTC

Re: Add angle brackets for required args in argparse

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From: nntp.mbo...@spamgourmet.com (Mark Bourne)
Newsgroups: comp.lang.python
Subject: Re: Add angle brackets for required args in argparse
Date: Mon, 20 Feb 2023 20:39:22 +0000
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by: Mark Bourne - Mon, 20 Feb 2023 20:39 UTC

scruel tao wrote:
> If we have the following code:
> ```
> parser = argparse.ArgumentParser(description="test")
> parser.add_argument('path')
> ```
>
> Run it without args, will get error message:
> ```
> usage: test.py [-h] path
> test.py: error: the following arguments are required: path
> ```
>
> However, I hope the message can be as the following:
> ```
> usage: test.py [-h] <path>
> test.py: error: the following arguments are required: path
> ```

The `metavar` argument to `add_argument` can be used to control how an
argument is represented in the usage text:
```
import argparse
parser = argparse.ArgumentParser(description='test')
parser.add_argument('path', metavar='<path>')
parser.parse_args()
```

Which results in:
```
usage: test.py [-h] <path>
test.py: error: the following arguments are required: <path>
```

> Or might can consider to provide a way to let user have there own style, like:
> ```
> usage: test.py [-h] path
> ```

It's also possible to create a custom help formatter, overriding
appropriate methods to control the formatting. For example:
```
import argparse

class CustomHelpFormatter(argparse.HelpFormatter):
def _get_default_metavar_for_positional(self, action):
default = super()._get_default_metavar_for_positional(action)
return f'<{default}>'

parser = argparse.ArgumentParser(
description='test',
formatter_class=CustomHelpFormatter)
parser.add_argument('path')
parser.parse_args()
```

Which results in:
```
usage: test.py [-h] <path>
test.py: error: the following arguments are required: path
```

That's a bit closer to what you asked for, since the required argument
shown in the error message doesn't include the angle brackets. It also
avoids needing to specify a `metavar` for every positional argument.
However, it is overriding a non-public method of the `HelpFormatter`
class, so might not work across all Python versions if the name or
signature of that method changes (even if it does work with all current
versions, it might break in future).

--
Mark.

Re: Add angle brackets for required args in argparse

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From: scru...@hotmail.com (scruel tao)
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Subject: Re: Add angle brackets for required args in argparse
Date: Thu, 23 Feb 2023 02:43:23 +0000
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by: scruel tao - Thu, 23 Feb 2023 02:43 UTC

"If you are afraid of loneliness, don't marry." -- Chekhov

devel / comp.lang.python / Add angle brackets for required args in argparse

Subject	Author
Add angle brackets for required args in argparse	scruel tao
Re: Add angle brackets for required args in argparse	Mark Bourne
Re: Add angle brackets for required args in argparse	scruel tao