The mitmproxy package (at 2.0.2-2 on my system) is broken by today's upgrade of python-construct from 2.8.22-1 to 2.9.34-1. After the upgrade, mitmproxy (when launched without any arguments, using the default settings) immediately crashes with the stacktrace shown below. Upon downgrading to python-construct-2.8.22-1, mitmproxy starts working again.

Traceback (most recent call last):
File "/usr/bin/mitmproxy", line 11, in <module>
load_entry_point('mitmproxy==2.0.2', 'console_scripts', 'mitmproxy')()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 572, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2755, in load_entry_point
return ep.load()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2408, in load
return self.resolve()
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2414, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/lib/python3.6/site-packages/mitmproxy/tools/main.py", line 12, in <module>
from mitmproxy.tools import cmdline # noqa
File "/usr/lib/python3.6/site-packages/mitmproxy/tools/cmdline.py", line 10, in <module>
from mitmproxy.addons import view
File "/usr/lib/python3.6/site-packages/mitmproxy/addons/__init__.py", line 7, in <module>
from mitmproxy.addons import onboarding
File "/usr/lib/python3.6/site-packages/mitmproxy/addons/onboarding.py", line 2, in <module>
from mitmproxy.addons.onboardingapp import app
File "/usr/lib/python3.6/site-packages/mitmproxy/addons/onboardingapp/app.py", line 8, in <module>
from mitmproxy.proxy import config
File "/usr/lib/python3.6/site-packages/mitmproxy/proxy/__init__.py", line 2, in <module>
from .root_context import RootContext
File "/usr/lib/python3.6/site-packages/mitmproxy/proxy/root_context.py", line 3, in <module>
from mitmproxy.proxy import protocol
File "/usr/lib/python3.6/site-packages/mitmproxy/proxy/protocol/__init__.py", line 39, in <module>
from .tls import TlsClientHello
File "/usr/lib/python3.6/site-packages/mitmproxy/proxy/protocol/tls.py", line 7, in <module>
from mitmproxy.contrib import tls_parser
File "/usr/lib/python3.6/site-packages/mitmproxy/contrib/tls_parser.py", line 9, in <module>
from construct import (
ImportError: cannot import name 'Range'