project folder exactly as I have it localled. Steps to recreate bug below:

$ cd demo

Initiate Virtual Environment (Windows below, else source myEnv/Scripts/activate)

$ appEnv\Scripts\activate.bat

$ python -V <- should be python 3.6

if the environment doesn't work:

$ python -m venv appEnv

(appEnv) $ python -m pip install pip==9.0.1 flask zappa

test locally

cmd window 1:

python my_app.py

cmd window 2:

$ curl localhost:5000

output:

$ Hello Flask!

deploy

(appEnv) $ zappa deploy dev

Test (Where Bug Occurs)

(appEnv) $ curl <insert deployed lambda handle>

To run without bug:

delete "slim_handler": True from zappa_settings.json

(appEnv) $ zappa undeploy dev

(appEnv) $ zappa deploy dev