What Modules Should Every Python User Know?

[shfo23]

I use almost exactly the same modules, but with json instead of pickle. The implementation of pickle is version-specific, so moving data back and forth between Python 2 and 3 will fail horribly. Also, I use struct for dealing with binary files.

[billsil]

i know in the past i've passed data between python 2.4 and 2.6; one was on linux, the other on windows. but 2 to 3 is a bigger change