Package: python3-twisted Version: 17.4.0-2 Severity: serious Hi,
When using python3-twisted from backports (18.7.0-2~bpo9+1), I get the following error: Traceback (most recent call last): File "/usr/lib/python3.5/runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "/usr/lib/python3.5/runpy.py", line 85, in _run_code exec(code, run_globals) File "/usr/lib/python3/dist-packages/synapse/app/homeserver.py", line 27, in <module> from twisted.internet import defer, reactor File "/usr/lib/python3/dist-packages/twisted/internet/reactor.py", line 38, in <module> from twisted.internet import default File "/usr/lib/python3/dist-packages/twisted/internet/default.py", line 56, in <module> install = _getInstallFunction(platform) File "/usr/lib/python3/dist-packages/twisted/internet/default.py", line 44, in _getInstallFunction from twisted.internet.epollreactor import install File "/usr/lib/python3/dist-packages/twisted/internet/epollreactor.py", line 24, in <module> from twisted.internet import posixbase File "/usr/lib/python3/dist-packages/twisted/internet/posixbase.py", line 18, in <module> from twisted.internet import error, udp, tcp File "/usr/lib/python3/dist-packages/twisted/internet/udp.py", line 53, in <module> from twisted.internet import base, defer, address File "/usr/lib/python3/dist-packages/twisted/internet/base.py", line 27, in <module> from twisted.internet._resolver import ( File "/usr/lib/python3/dist-packages/twisted/internet/_resolver.py", line 25, in <module> from twisted.internet.address import IPv4Address, IPv6Address File "/usr/lib/python3/dist-packages/twisted/internet/address.py", line 23, in <module> class IPv4Address(object): File "/usr/lib/python3/dist-packages/twisted/internet/address.py", line 37, in IPv4Address type = attr.ib(validator=attr.validators.in_(["TCP", "UDP"])) AttributeError: module 'attr.validators' has no attribute 'in_' I had python3-attr 16.3.0-1 installed. If I upgrade it to 17.4.0-2~bpo9+1, the problem goes away. I'm filing this against 17.4.0-2 since I think it applies to all versions, including the version in testing. Kurt