def check_required_dependencies(self):
    if (not Exchange.has_web3()):
        raise NotSupported('Web3 functionality requires Python3 and web3 package installed: https://github.com/ethereum/web3.py')
def check_required_dependencies(self):
    if (not Exchange.has_web3()):
        raise NotSupported('Web3 functionality requires Python3 and web3 package installed: https://github.com/ethereum/web3.py')