> Python has always been a mixed bag for me. What I wrote in it worked, when I wrote it. Then, a little while later it stops working, either because some module

> Python has always been a mixed bag for me. What I wrote in it worked, when I wrote it. Then, a little while later it stops working, either because some module that it depends on gets deprecated or changed in an incompatible way, starts to exhibit weird behavior or even disappears. This is no longer a problem in Python because of virtualenv and pip, which together allow you to tie down the version numbers of all the dependencies an application uses.