pkg_resources performance issues

[tgbugs]

pypa/setuptools#510

markdown/markdown/core.py

Line 26 in ada40c6

import pkg_resources

One potential fix (that I have implemented manually) is to move the import statement inside

markdown/markdown/core.py

Line 154 in ada40c6

entry_points = [ep for ep in pkg_resources.iter_entry_points('markdown.extensions', ext_name)]

and add an if statement to check it has already been imported and assigned as an instance variable.

[waylan]

A PR is welcome. And if you can provide some performance data with the PR that would be helpful.

[mitya57]

It may be also worth to switch to importlib.metadata module from the standard library, to get rid of pkg_resources runtime dependency. It is new in Python 3.8, but there is a backport to older versions too.

I haven't measured the performance though, but I expect that it will be definitely not slower than pkg_resources.

[waylan]

I hadn't seen importlib.metadata before. Cool! Thanks for the pointer.