Confusing error message when options for `python` are erroneously quoted

Bug report

Bug description:

#!/bin/python -q -i

I was writing an unrelated post about shebang lines tricks+tips, and happened to pick python as an example, only to discover some weird behavior. The above gets parsed as /bin/python "-q -i" <path/to/script>

But the message python prints is quite confusing:

Unknown option: - 
usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `python -h' for more information.

What's happening is that the "unknown option" is a single space, being parsed as a short-form option, and printed. But the output is pretty opaque, since the space is not quoted, and it's just a trailing invisible space.

Aside: Several other invalid one-byte options like \n get printed wrongly. This doesn't seem worth fixing.

Proposed fix:

I think the shebang case happens to users often enough that it would be good to have some kind of better error message if a short-form options list contains either of

• - (this would require scanning ahead!), which either indicates some quoting problem, or an incorrect long-form option (-check-hash-based-pycs rather than --check-hash-based-pycs).

I think a good error message could be unknown option: -q -i or unknown option: "-q -i". Quoting the argument when it contains a space seems clearer to me.

The current long-form options have pretty clear error messages either way, mostly by happenstance.

Currently, -help-* parses as -h which then prints help, stopping option parsing. I have no strong opinion about whether that behavior is better or worse than printing an error message.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Tái hiện lời gọi shebang được báo cáo /bin/python -q -i và kiểm tra việc phân tích cú pháp tùy chọn dòng lệnh của CPython cùng các entry point báo cáo lỗi. Tập trung vào cách một chuỗi tùy chọn được đặt trong dấu ngoặc kép trở thành một tùy chọn dạng ngắn, sau đó xác minh rằng chẩn đoán kết quả nhận diện rõ ràng đối số không hợp lệ mà không thay đổi hành vi của các tùy chọn một byte không hợp lệ không liên quan.