Trying to import Bitcoin ATM wallet into Armory
I'm very curious why does Armory scan the private key I have imported takes for a long time. 

However, sweeping a bitcoin from a paper wallet should be very simple.
Install and use a Mycelium wallet app on your phone. Scan the QR private key on the paper wallet and send it to the Armory's QR receiving address. 

In this case, you are using the Mycelium wallet as a bridge and nothing is compromised. You can also just throw away the paper wallet. 

Just maybe the problem is with pycoin. I'm trying to use an offline bitaddress.org to import my private key to Armory.