Shall I worry about python2/3 compatibility when using library?

[Stone Zhong]

Hi there,

I think the fact is:
- There are still considerable amount of people still using python2
- Python2 user will eventually upgrade to python3

So any library not written in a compatible way will either break now for python2 user, or will break in the future for python3 user. So I suppose all library developer are writing compatible code, is that a fair assumption?

Thanks,
Stone