Bring back the old version variable

[ghost]

To fix an AttributeError for backward-compatibility:

if markdown.version <= '2.2':
AttributeError: module 'markdown' has no attribute 'version'

In this case from django-rest-framework.

[waylan]

I'm really annoyed by this. I only want to have the __version__ variable, but a version variable name that is not consistent across versions is not very useful. Sigh.

Thanks for the patch.

[ghost]

Yeah, I feel your pain. My first reaction was to submit a PR to django-restframework, but then realized this will be a common problem with other code that uses Python-Markdown. The backwards-compatibility woes of a popular library. ;-)

[mitya57]

Note that Python-Markdown 2.6.11 had a version_info attribute too (as opposed to __version_info__ in 3.0). There is (at least some) third-party code that uses it too:

https://codesearch.debian.net/search?q=markdown.version_info