At this point all packages work with Python 3. If you use ones that don't, they are not maintained, and you shouldn't use them. [1] A one that I often seen was

At this point all packages work with Python 3. If you use ones that don't, they are not maintained, and you shouldn't use them. [1] A one that I often seen was MySQL-python. That package hasn't been touched since 2014. Another one I've seen was PIL, that one was last released in 2009, and isn't even on PyPI, because it is that old, fortunately maybe because it's not on PyPI, people are more aware of Pillow which is a drop in replacement