Substiitute of dev_appserver.py of Google App Engine [Need to upgrade to FLEXIBLE environment]

Question

I have a Flask-restful API(micro-service) written in python 2.7 using Google Cloud STANDARD environment, and dev_appserver.py(gcloud sdk) helps to run it locally.

Now, I plan to do three things:

1. Upgrade the code from Python 2.7 to Python 3.5
2. Google Cloud STANDARD environment to Google cloud FLEXIBLE environment Question: but standard environment uses AppEngine library and methods, that don't work in flexible environment, so, can Google Cloud Client libraries solve the purpose?
3. Run locally and test the micro-service Question: Please give suggestions to replace dev_appserver.py

Answer 1

2. There are a lot of differences between the environments. A lot of methods and libs from standard won't work in flex.

   See here for more info:

   • https://cloud.google.com/appengine/docs/the-appengine-environments
   • https://cloud.google.com/appengine/docs/flexible/python/flexible-for-standard-users
   • https://cloud.google.com/appengine/docs/flexible/python/migrating

3. You can't use dev_appserver.py in flex environment. You will need to run Flask the regular way. e.g (locally) FLASK_APP=main.py FLASK_DEBUG=1 python -m flask run --port 8080