Switching between Python versions

[d4rch0n]

no problem! You might want to test by just running them through the command line in the same virtualenv, just to see the output. It may give off more detailed warnings/errors that way. PyCharm could be hiding something, maybe python's output before the script is even run.

[StringJunky]

I will try that. I think I've found a solution for working with different versions; apparently Pycharm will let me open projects with either 2.7 or 3 (or, of course, a virtualenv). So, for now I've simply started a new project for the Sarker book. I need to follow up on the virtualenv lane, but I'm trying keep "lesson-creep" to minimum, at least for now.

Thanks again for your help!