How to check if WindowsPath is_absolute() if path is provided in posix format (ie '/windows/')

I have a CLI that is suppose to accept absolute paths but not relative paths. I set up my promp_toolkit PathCompleter to only complete absolute paths, only to be surprised that it would allow me to use posix strings to resolve windows directories. So for example if I want something in C:\Windows I can put /windows and it will understand I’m referring to the C: and autocomplete correctly. An odd but potentially mildly useful feature.

Only problem is that when I call is_absolute() on the a WindowsPath of ‘/windows’ it returns False, despite it effectively referring to an absolute path. So now I have an autocompleter that will complete a string that my argparser then complains about, not so good.

Is there a way to determine that the posix format string is still refering to an absolute Windows path so I can manage to not barf on these sort of paths? If not I’ll have to figure out some way to keep autocompleter from suggesting them.

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