learning unit testing in python

[Alex]

Hi all.

I'd like learn some basic unit testing with python.
I red some articles about different testing framework like unittest or
nose, but I'm a bit confused: what is the best choice? I'm not a
professional developer (I'm a SEO) but I belive that unit testing is a
good and pragmatic way to produce working software, so I'd like to
find something really simple ad straightforward because I don't have
to manage big programming projects.

Thanks in advance,

Alex