Markdown 3.0 installation causes startup exception

[michaelsteigman]

Markdown 3.0 was release a few days ago. Due to the >= requirement for Markdown, it is installed now by default. ImagePattern, which pinax-blog imports, has been removed. The result, for sites using pinax-blog deploying a new instance of their application is the following fatal exception during startup:

File "/opt/app-root/lib/python3.6/site-packages/pinax/blog/urls.py", line 4, in <module>
 from .views import (
File "/opt/app-root/lib/python3.6/site-packages/pinax/blog/views.py", line 25, in <module>
from .parsers.markdown_parser import parse
File "/opt/app-root/lib/python3.6/site-packages/pinax/blog/parsers/markdown_parser.py", line 2, in <module>
 from markdown.inlinepatterns import IMAGE_LINK_RE, ImagePattern
 ImportError: cannot import name 'ImagePattern'

[amhazeem]

This can be fixed by uninstalling markdown 3.0

pip uninstall markdown

Then install an earlier version

pip install Markdown==2.6.11

This worked for me

[doktormerlin]

I created pull request #123 for this

For future people having the same problem:

Instead of uninstalling Markdown first, you can just use pip install -U markdown==2.6.11 for a step less

[KatherineMichel]

Closed by #123