A fast and modern Python SOAP client

Highlights:

- Compatible with Python 2.7, 3.3, 3.4, 3.5, 3.6, 3.7 and PyPy
- Built on top of lxml and requests
- Support for Soap 1.1, Soap 1.2 and HTTP bindings
- Support for WS-Addressing headers
- Support for WSSE (UserNameToken / x.509 signing)
- Support for tornado async transport via gen.coroutine (Python 2.7+)
- Support for asyncio via aiohttp (Python 3.5+)
- Experimental support for XOP messages