flake8 is missing and thus no unit tests run

Unit tests failed to run because of the lack of flake8 It does not seem to be specified neither in GettingStarted nor requirements.txt.

For me, I just installed it in my global directory (i.e. pip install flake8), which worked fine. I am wondering if above is the right way, or should I install it in app/vendors by specifying it in requirements.txt?

Probably only a few usage of flake8 is at setup.cfg. If I am not mistaken, it is referring to the global one (vs. app/vendors?)

$ tools/all_tests

No config file found, using default configuration
--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)
/usr/bin/python: No module named flake8

$ pip install flake8 # Successfully installed flake8-3.8.4

google / personfinder

flake8 is missing and thus no unit tests run #762