#398 AttributError when using yaml_set_comment_before_after_key with "\n"

[Bastien gerard]

First of all, thanks for the library and thanks a lot for the quick recent fixes, this is really appreciated!!

Further to my last ticket (https://sourceforge.net/p/ruamel-yaml/tickets/397/), It's working perfectly fine for any comments except "\n", it looks like it's entering a different condition.

from ruamel.yaml import YAML

yaml = YAML()

yaml_str = """
stages:
  # some_comment
  - test
  - build
"""

data = yaml.load(yaml_str)
data.yaml_set_comment_before_after_key("stages", before="\n")
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-19-8808c27d78ca> in <module>
     14 #Comment(start=None, items={ stages: [None, None, None, [CommentToken('# some_comment\n', line: 2, col: 2)]]})
     15 
---> 16 data.yaml_set_comment_before_after_key("stages", before="\n")

~/.pyenv/versions/3.8.6/envs/gitlabci-jsonschema-lint/lib/python3.8/site-packages/ruamel/yaml/comments.py in yaml_set_comment_before_after_key(self, key, before, indent, after, after_indent)
    393         c = self.ca.items.setdefault(key, [None, [], None, None])
    394         if before == '\n':
--> 395             c[1].append(comment_token("", start_mark))
    396         elif before:
    397             if c[1] is None:

AttributeError: 'NoneType' object has no attribute 'append'

[Anthon van der Neut]

Should be fixed in 0.17.16

[Bastien gerard]

Do you have any estimate on when 0.17.16 will be released? just asking so that I know if it's a matter of days or if I should find a workaround .
Again, Thanks a lot for the support

[Anthon van der Neut]

I though I had already pushed that to pypi as I wrote that, but somehow it hadn't and now the terminal window is no longer open to see what kind of error caused that. Thanks for reminding

[Bastien gerard]

Works like a charm, thanks