Migrate to Python 3 runtime of Google App Engine

[aktech]

This migrates the application to Python3 runtime of Google App Engine.

• Remove submodules
• Remove vendor requirements
• Use requirements.txt
• Add .gcloudignore
• Make application compatible with Python 3.7
• Run app directly instead of Docker compose.

Further cleanups will happen in later Pull requests.

[asmeurer]

So the submodules aren't needed anymore?

[aktech]

Yes, they aren't needed anymore. We install everything via requirements.txt

[asmeurer]

I see. IIRC we were pinned to some commit between versions. We should make sure 0.7.5 doesn't break anything.

[aktech]

Yes, correct. I tried to break, but everything seems to work of what I tried: https://py3-runtime-dot-sympy-gamma-hrd.appspot.com/

[aktech]

I have tried all the possible cases I can think of and the tests passes as well. I'll merge this in next 48 hours if no objections.

[asmeurer]

We can still do a quick revert in the deploy if this ends up breaking, right?

[aktech]

Yup, quite easily.

[asmeurer]

OK. I wasn't sure if switching the runtime had an effect on that.

[WaleedSaleh]

I would really thank you for this perfect work
but when running the app it is plain HTML there are no styles, whereas the styles respond with 200 status code.

[aktech]

@WaleedSaleh It could be a caching issue, can you try doing a Hard refresh on your browser (you can Google for your browser on how to do that.). Also just to confirm, can you share the command you are using to run the app?

[aktech]

@WaleedSaleh I see why you're seeing that error, you need to set Debug=True in settings.py for serving static files locally:

sympy_gamma/app/settings.py

Line 26 in 17b9f0e

DEBUG = False

I have created a PR for mentioning this in the README: #158 Thanks for pointing this out.

[WaleedSaleh]

You're welcome, I used docker-compose up for running the app because when using "python mange.py runserver" this error occurs:

File "C:\Users\walee\OneDrive\Desktop\Freelance\sympy_gamma\venv\lib\site-packages\grpc_init_.py", line 23, in
from grpc._cython import cygrpc as _cygrpc
File "src\python\grpcio\grpc_cython\cygrpc.pyx", line 27, in init grpc.cython.cygrpc
File "C:\Users\walee\AppData\Local\Programs\Python\Python37\lib\asyncio_init.py", line 39, in
from .windows_events import *
File "C:\Users\walee\AppData\Local\Programs\Python\Python37\lib\asyncio\windows_events.py", line 19, in
from . import windows_utils
File "C:\Users\walee\AppData\Local\Programs\Python\Python37\lib\asyncio\windows_utils.py", line 126, in
class Popen(subprocess.Popen):
TypeError: NoneType takes no arguments

[aktech]

@WaleedSaleh docker-compose up is the correct command. If you make the change suggested above it's should work.

[WaleedSaleh]

@aktech thank you, it worked with docker-compose up