问题描述：
You do not have a working installation of the service_identity module: 'cannot import name opentype'. Please install it from <https://pypi.python.org/pypi/service_identity> and make sure all of its dependencies are satisfied. Without the service_identity module, Twisted can perform only rudimentary TLS client hostname verification. Many valid certificate/hostname mappings may be rejected.
wifi-pumpkin.py: cannot connect to X server
解决方法：pip install -I -U service_identity
