setup.py fails

[nigelhorne]

`...
Best match: websockets 10.4
Processing websockets-10.4.tar.gz
Writing /tmp/easy_install-hjxdwckn/websockets-10.4/setup.cfg
Running websockets-10.4/setup.py -q bdist_egg --dist-dir /tmp/easy_install-hjxdwckn/websockets-10.4/egg-dist-tmp-mtkeexje
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 154, in save_modules
yield saved
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 195, in setup_context
yield
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 250, in run_setup
_execfile(setup_script, ns)
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 45, in _execfile
exec(code, globals, locals)
File "/tmp/easy_install-hjxdwckn/websockets-10.4/setup.py", line 21, in

File "", line 1
SyntaxError: future feature annotations is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "setup.py", line 100, in
cmdclass={"upload": UploadCommand,},
File "/usr/lib/python3.6/site-packages/setuptools/init.py", line 129, in setup
return distutils.core.setup(**attrs)
File "/usr/lib64/python3.6/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/lib64/python3.6/distutils/dist.py", line 955, in run_commands
self.run_command(cmd)
File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
cmd_obj.run()
File "/usr/lib/python3.6/site-packages/setuptools/command/install.py", line 67, in run
self.do_egg_install()
File "/usr/lib/python3.6/site-packages/setuptools/command/install.py", line 117, in do_egg_install
cmd.run()
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 411, in run
self.easy_install(spec, not self.no_deps)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 659, in easy_install
return self.install_item(None, spec, tmpdir, deps, True)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 706, in install_item
self.process_distribution(spec, dist, deps)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 751, in process_distribution
[requirement], self.local_index, self.easy_install
File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 770, in resolve
replace_conflicting=replace_conflicting
File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 1053, in best_match
return self.obtain(req, installer)
File "/usr/lib/python3.6/site-packages/pkg_resources/init.py", line 1065, in obtain
return installer(requirement)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 678, in easy_install
return self.install_item(spec, dist.location, tmpdir, deps)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 704, in install_item
dists = self.install_eggs(spec, download, tmpdir)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 889, in install_eggs
return self.build_and_install(setup_script, setup_base)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 1157, in build_and_install
self.run_setup(setup_script, setup_base, args)
File "/usr/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 1143, in run_setup
run_setup(setup_script, args)
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 253, in run_setup
raise
File "/usr/lib64/python3.6/contextlib.py", line 99, in exit
self.gen.throw(type, value, traceback)
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 195, in setup_context
yield
File "/usr/lib64/python3.6/contextlib.py", line 99, in exit
self.gen.throw(type, value, traceback)
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 166, in save_modules
saved_exc.resume()
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 141, in resume
six.reraise(type, exc, self._tb)
File "/usr/lib/python3.6/site-packages/setuptools/_vendor/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 154, in save_modules
yield saved
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 195, in setup_context
yield
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 250, in run_setup
_execfile(setup_script, ns)
File "/usr/lib/python3.6/site-packages/setuptools/sandbox.py", line 45, in _execfile
exec(code, globals, locals)
File "/tmp/easy_install-hjxdwckn/websockets-10.4/setup.py", line 21, in

SyntaxError: future feature annotations is not defined`