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Re: let*: Wrong type argument: stringp, nil
From: |
Emanuel Berg |
Subject: |
Re: let*: Wrong type argument: stringp, nil |
Date: |
Wed, 29 Sep 2021 06:35:33 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Hongyi Zhao wrote:
> (defun try/pyvenv-workon ()
> (when (locate-dominating-file (buffer-file-name) ".python-version")
>
> ;https://emacs.stackexchange.com/questions/9474/let-statement-throws-error-on-assigning-a-form-to-a-variable
> (let ((file (concat (locate-dominating-file (buffer-file-name)
> ".python-version") ".python-version")))
> (pyvenv-workon (with-temp-buffer
> (insert-file-contents file)
> (nth 0 (split-string (buffer-string))))))))
>
> BTW, should I use `let' or `let*' here?
`let*' always works, `let' works when there is no references
to previous bindings in any binding...
So if it works and you have let, you have done the
right thing!
In theory, because of the independence of the individual
bindings with let, it can be used to compute in parallel - but
I don't think that actually happens - an urban legend ...
In your code you only have "file" so while both would work,
let* is unnecessary ...
--
underground experts united
https://dataswamp.org/~incal
- Re: let*: Wrong type argument: stringp, nil, (continued)
- Re: let*: Wrong type argument: stringp, nil, Hongyi Zhao, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Emanuel Berg, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Hongyi Zhao, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Emanuel Berg, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Hongyi Zhao, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Yuri Khan, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Hongyi Zhao, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Yuri Khan, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Hongyi Zhao, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil, Emanuel Berg, 2021/09/29
- Re: let*: Wrong type argument: stringp, nil,
Emanuel Berg <=
- Re: let*: Wrong type argument: stringp, nil, Hongyi Zhao, 2021/09/29