py-gfm (GithubFlavoredMarkdownExtension) が import できない時の対処法[Python3] ref: https://qiita.com/kozzy/items/35c92fb6be4c8de916c4

bash

$ pip3 install markdown
$ pip3 uninstall markdown

file0.txt

pip3 uninstall markdown
pip3 install git+https://github.com/Python-Markdown/markdown.git@regex-fixes

file10.txt

pip3 uninstall markdown
pip3 install git+https://github.com/Python-Markdown/markdown.git@2.6

file11.txt

import markdown

markdown.inlinepatterns.BRK

file12.txt

'\\[([^\\]\\[]*(\\[[^\\]\\[]*(\\[[^\\]\\[]*(\\[[^\\]\\[]*(\\[[^\\]\\[]*(\\[[^\\]\\[]*(\\[[^\\]\\[]*\\])*[^\\]\\[]*\\])*[^\\]\\[]*\\])*[^\\]\\[]*\\])*[^\\]\\[]*\\])*[^\\]\\[]*\\])*[^\\]\\[]*)\\]'

file14.txt

%load_ext tsumiki

jupyter-notebook_markdown_cell

%%tsumiki

:Markdown:
# Title

:HTML:::
<p>col0</p>
<font color="red">Red</font>
</br>
<font color="green">Green</font>

:Markdown:::
col1
* list1
* list2

:Markdown:::
col2
* list1
* list2

python3

    import markdown
    from mdx_gfm import GithubFlavoredMarkdownExtension

    source = """
    Hello, *world*! This is a ~~good~~marvelous day!
    Here is an auto link: https://example.org/

    Le me introduce you to [task lists] (https://github.com/blog/1375-task-lists-in-gfm-issues-pulls-comments):

    - [ ] eggs
    - [x] milk

    You can also have fenced code blocks:
    ```
    import this
    ```
    """

    # Direct conversion
    html = markdown.markdown(source,
                             extensions=[GithubFlavoredMarkdownExtension()])

    # Factory-like
    md = markdown.Markdown(extensions=[GithubFlavoredMarkdownExtension()])
    html = md.convert(source)

result

    ---------------------------------------------------------------------------

    AttributeError                            Traceback (most recent call last)

    <ipython-input-2-58535ab67692> in <module>()
          1 import markdown
          2 
    ----> 3 markdown.inlinepatterns.BRK


    AttributeError: module 'markdown.inlinepatterns' has no attribute 'BRK'