Bug#904298: python3-tango: fails to install with python 3.7 as a supported python version

[Andreas Beckmann]

Package: python3-tango
Version: 9.2.3-1
Severity: serious
User: debian-qa at lists.debian.org
Usertags: piuparts
Control: block 902788 with -1 

Hi,

during a test with piuparts I noticed your package failed to install. As
per definition of the release team this makes the package too buggy for
a release, thus the severity.

>From the attached log (scroll to the bottom...):

  Setting up python3-tango (9.2.3-1+b1) ...
    File "/usr/lib/python3/dist-packages/tango/asyncio_tools.py", line 94
      _chain_future(asyncio.async(coro, loop=loop), future)
                                ^
  SyntaxError: invalid syntax
  
    File "/usr/lib/python3/dist-packages/tango/gevent_executor.py", line 127
      watcher = self.hub.loop.async()
                                  ^
  SyntaxError: invalid syntax
  
  dpkg: error processing package python3-tango (--configure):
   installed python3-tango package post-installation script subprocess returned error exit status 1


"async" has become a reserved keyword in python 3.7


cheers,

Andreas
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