steemconnect: TransactionBuilder example gives empty output string about beem

[crokkon]

Found the reason:
print() calls TransactionBuilder.constructTx() via __repr__() -> __str__ -> json(), so a workaround could be to use

pprint(sc2.url_from_tx(tx.json()))

or

tx.appendOps(op)
tx.constructTx()
pprint(sc2.url_from_tx(tx))

so I guess this is a documentation issue, not really a bug?

Edit: thinking a bit more about it, I'm not sure if it is a good idea that a print(tx) changes tx?