Re: let*: Wrong type argument: stringp, nil

[Emanuel Berg]

Hongyi Zhao wrote:

> Now I'm trying another test code snippet based on the idea
> posted here [1]:
>
> (defun desperately-pyvenv-workon()
>  "Traveling up the path, find a `.python-version' and activate the
>  corresponding virtualenv."
>  (interactive)
>  (with-temp-buffer
>     (unless (equal(getenv "HOME") default-directory)
>     (while (not (file-exists-p ".python-version"))
>           (cd "..")
>     ))
>     (when(file-exists-p ".python-version")
>       (message(expand-file-name ".python-version")))))
>
> (desperately-pyvenv-workon)
>
> [1] https://emacs.stackexchange.com/a/7477
>
> But when I test the above code in scratch buffer, it seems to be stuck
> in an endless loop and running there all the time.

Eval this

  (cd "..")

enough times and it alternates between "/" and "/../"
indefinitely, maybe that's what happens?

(But I don't know why, or what it tries to say with "/../"
which should be equivalent to "/" ... in the shell, cd from /
does not lead to /../ but will stay in /)

Also, if you are just looking for a file, isn't there better
ways to do that?

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