ImportError: No module named cheroot

[the-dbp]

Process Process-5:
Traceback (most recent call last):
File "/usr/lib/python2.7/multiprocessing/process.py", line 267, in _bootstrap
self.run()
File "/usr/lib/python2.7/multiprocessing/process.py", line 114, in run
self._target(*self._args, **self._kwargs)
File "silvia-pi.py", line 297, in rest_server
run(host='0.0.0.0',port=conf.port,server='cheroot')
File "/root/silvia-pi/bottle.py", line 3703, in run
server.run(app)
File "/root/silvia-pi/bottle.py", line 3281, in run
from cheroot import wsgi
ImportError: No module named cheroot

trying to run pip install cheroot gives:

Process Process-5:
Traceback (most recent call last):
File "/usr/lib/python2.7/multiprocessing/process.py", line 267, in _bootstrap
self.run()
File "/usr/lib/python2.7/multiprocessing/process.py", line 114, in run
self._target(*self._args, **self._kwargs)
File "silvia-pi.py", line 297, in rest_server
run(host='0.0.0.0',port=conf.port,server='cheroot')
File "/root/silvia-pi/bottle.py", line 3703, in run
server.run(app)
File "/root/silvia-pi/bottle.py", line 3281, in run
from cheroot import wsgi
ImportError: No module named cheroot
root@raspberrypi:~/silvia-pi# pip install cheroot
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting cheroot
Using cached https://files.pythonhosted.org/packages/bf/be/51b1517c6dbf3851d44b36ff08a6e1012464149f89f74c46b29d2f76545e/cheroot-8.2.1-py2.py3-none-any.whl
Collecting backports.functools-lru-cache; python_version < "3.3" (from cheroot)
Using cached https://files.pythonhosted.org/packages/da/d1/080d2bb13773803648281a49e3918f65b31b7beebf009887a529357fd44a/backports.functools_lru_cache-1.6.1-py2.py3-none-any.whl
Collecting more-itertools>=2.6 (from cheroot)
Using cached https://files.pythonhosted.org/packages/2f/9d/dcfe59e213093695f108508af1214cf9cd95cc5489e46877ec5cb56369e5/more_itertools-5.0.0-py2-none-any.whl
Requirement already satisfied: six>=1.11.0 in /usr/lib/python2.7/dist-packages (from cheroot) (1.12.0)
Collecting jaraco.functools (from cheroot)
Using cached https://www.piwheels.org/simple/jaraco-functools/jaraco.functools-3.0.0-py2.py3-none-any.whl
jaraco.functools requires Python '>=3.6' but the running Python is 2.7.16