[Python-modules-team] Bug#902900: python3-celery: python3-celery fails to install with Python 3.7

[Antoine R. Dumont]

Package: python3-celery
Version: 4.1.0-4
Severity: serious
Hello,

Setting up python3-celery (4.2.0-1) ...
  File "/usr/lib/python3/dist-packages/celery/backends/redis.py", line 22
    from . import async, base
                      ^
SyntaxError: invalid syntax

  File "/usr/lib/python3/dist-packages/celery/backends/rpc.py", line 20
    from .async import AsyncBackendMixin, BaseResultConsumer
              ^
SyntaxError: invalid syntax

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


Note:
- main environment: testing
- architecture: x86_64
- Action: using sbuild with sid chroot to build a package whose
  build/runtime dependency is python3-celery
- Expected outcome: package build success
- Actual outcome: package build failed

Cheers,
--
tony / @ardumont

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