How can I connect to testnet with pywaves

have a simple code to try and get the balance from my testnet wallet… I keep on getting zero

import pywaves as pw

pw.setChain( chain = ‘testnet’)
myAddress = pw.Address(‘3NAUfMNPL5bAF9wu22Z847zNYjiCCCKGqor’)

print(“Your balance is %18d” % myAddress.balance())

I keep on getting 0 as my balance… but when I use the wavesexplorer

Did you set the node adress?

node = ""
chain = "testnet"
pw.setNode(node=node, chain=chain)