[Python-modules-team] Bug#911771: IPv4: AttributeError: 'module' object has no attribute 'in_'

[Ulrike Uhlig]

package: python-twisted
severity:  normal

Dear Maintainer,

when launching torbrowser-launcher, that relies on python-twisted, I get
the following error:

  File "/usr/bin/torbrowser-launcher", line 29, in <module>
    import torbrowser_launcher
  File
"/usr/lib/python2.7/dist-packages/torbrowser_launcher/__init__.py", line
33, in <module>
    from .common import Common, SHARE
  File "/usr/lib/python2.7/dist-packages/torbrowser_launcher/common.py",
line 55, in <module>
    from twisted.internet import gtk2reactor
  File
"/usr/lib/python2.7/dist-packages/twisted/internet/gtk2reactor.py", line
23, in <module>
    from twisted.internet import _glibbase
  File "/usr/lib/python2.7/dist-packages/twisted/internet/_glibbase.py",
line 20, in <module>
    from twisted.internet import base, posixbase, selectreactor
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line
27, in <module>
    from twisted.internet._resolver import (
  File "/usr/lib/python2.7/dist-packages/twisted/internet/_resolver.py",
line 25, in <module>
    from twisted.internet.address import IPv4Address, IPv6Address
  File "/usr/lib/python2.7/dist-packages/twisted/internet/address.py",
line 23, in <module>
    class IPv4Address(object):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/address.py",
line 37, in IPv4Address
    type = attr.ib(validator=attr.validators.in_(["TCP", "UDP"]))

I'm using 18.7.0-2~bpo9+1 and
python 2.7.13-2 (as the default on Stretch).

Cheers,
u.