Great tool, thank you. up voted and followed you.

And for

If you are delegating SP, currently the only option to un-delegate is with the blockchain API. If you do not know how to use this, then you likely will not be able to get this SP back unless/until a third-party tool is developed that allows you to un-delegate.

There is a easy way to do it with official STEEM library for Python

Just delegate 0 vesting_shares to delegatee!

For example:

from steem import Steem
steem = Steem()
steem.delegate_vesting_shares('user1', '0 VESTS', chinadaily)