PYTHONPATH not working for sudo on GNU/Linux (works for root)

Question

EDIT: Works for root, sudo is the problem. Read below.

I have a directory with my own libraries, e.g. my Python libraries are located at /home/name/lib/py

Answer 1

Another tip:

sudo echo $PYTHONPATH:
    /home/name/lib/py

It won't work. Shell will interpret it like this:

1) expand $PYTHONPATH from env variable for example: /usr/lib/python

2) execute "sudo echo /usr/lib/python"