Dear Stardiviner,

I used the "scimax" configuration. Scimax's maintainer, John Kitchin,
helped me out to find the root cause of the problem, i.e. the following
addition to " python-font-lock-keywords":

(setq python-font-lock-keywords
      (append python-font-lock-keywords
     '(;; this is the full string.
;; group 1 is the quote type and a closing quote is matched
;; group 2 is the string part
(
;; "f\\(['\"]\\{1,3\\}\\)\\([^\\1]+?\\)\\1"
"f\\(['\"]\\{1,3\\}\\)\\(.+?\\)\\1"
;; these are the {keywords}
("{[^}]*?}"
 ;; Pre-match form
 (progn (goto-char (match-beginning 0)) (match-end 0))
 ;; Post-match form
 (goto-char (match-end 0))
 ;; face for this match
 (0 font-lock-variable-name-face t))))))

Commenting out this code snippet, the fontfying / HTML-export problem goes
away.

Cheers,
sebastian




On Tue, Nov 3, 2020 at 6:50 AM stardiviner <numbchild@gmail.com> wrote:

> I have same problem sometimes in different babel languages.
> I would like to know what caused this problem too.
> Can you send me a message after you solved problem? Thanks in advance. :)
> smile
>
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>
>
> On Mon, Nov 2, 2020 at 2:26 AM Sebastian Gimeno <changimeno@gmail.com>
> wrote:
>
>> Hi,
>>
>> I am using emacs 27.1 and org-plus-contrib 20201026.
>>
>> I am having problems with the fontification of python and ipython source
>> blocks when the code contains curly brackets "{}" (other course blocks are
>> ok). For instance, the following snippet
>>
>> #+BEGIN_SRC python :results drawer
>> import matplotlib.pyplot as plt
>> plt.plot([1,2,3])
>> plt.show()
>> a=1
>> print("a={}".format{a})
>> #+END_SRC
>>
>> does not fontify correctly in either python or ipython source blocks.
>>
>> As a consequence, when exporting the org file to HTML (C-c C-e h h), it
>> fails with the following message:
>>
>> font-lock-fontify-keywords-region: Invalid function: #<subr progn>
>>
>> If changing the code snippet to:
>>
>> #+BEGIN_SRC python :results drawer
>> import matplotlib.pyplot as plt
>> plt.plot([1,2,3])
>> plt.show()
>> a=1
>> print("a=%s" % a)
>> #+END_SRC
>>
>> the block fontifies and the file is exported to HTML correctly.
>>
>> Can you reproduce this behaviour?
>>
>> Many thanks in advance!
>>
>