First, this appears to refer to an older version of the App platform UI. I figured it out eventually but the screens no longer look like, or are in the same order, as in the tutorial.
Second, there is a missing step regarding the assignment/equality operators for two lines in the sample
DEVELOPMENT_MODE = os.getenv("DEVELOPMENT_MODE", "False") == "True"
# ...
DEBUG = os.getenv("DEBUG", "False") == "True"
these will always evaluate
(bool) unless I have explicitly set my environment variable (e.g. on a dev machine) to
, for example by adding the following lines to the bottom of
export DEBUG="True"