[Python-modules-team] Bug#903529: python3-ws4py fails to install with Python 3.7 as supported version

[Adrian Bunk]

Package: python3-ws4py
Version: 0.4.2+dfsg1-2
Severity: grave
Control: block 902788 by -1

Setting up python3-ws4py (0.4.2+dfsg1-2) ...
  File "/usr/lib/python3/dist-packages/ws4py/async_websocket.py", line 87
    asyncio.async(closeit())
                ^
SyntaxError: invalid syntax

  File "/usr/lib/python3/dist-packages/ws4py/server/tulipserver.py", line 43
    f = asyncio.async(self.handle_initial_handshake())
                    ^
SyntaxError: invalid syntax

dpkg: error processing package python3-ws4py (--configure):
 installed python3-ws4py package post-installation script subprocess returned error exit status 1