pip install -r requirements.txt

 ERROR: Command errored out with exit status 1:
 command: /home/xxxx/yyyy/venv/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-oo12x6rg/flask_0df81e498beb43ea800714e7585a72fa/setup.py'"'"'; __file__='"'"'/tmp/pip-install-oo12x6rg/flask_0df81e498beb43ea800714e7585a72fa/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-m90xuwv9
 cwd: /tmp/pip-install-oo12x6rg/flask_0df81e498beb43ea800714e7585a72fa/
 Complete output (6 lines):
 Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File "/tmp/pip-install-oo12x6rg/flask_0df81e498beb43ea800714e7585a72fa/setup.py", line 62
 print "Audit requires PyFlakes installed in your system."
 ^
 SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Audit requires PyFlakes installed in your system.")?
 ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/49/0a/fe5021b35436202d3d4225a766f3bdc7fb51521ad89e73c5162db36cdbc7/Flask-0.9.tar.gz#sha256=2fd5d4ffe81f762dd2a3e58472d690a0dbba3766776506003aee3ed7aaa8afef (from https://pypi.org/simple/flask/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
 Using cached Flask-0.8.1.tar.gz (458 kB)
 ERROR: Command errored out with exit status 1:
 command: /home/xxxx/yyyy/venv/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-oo12x6rg/flask_5bbe7300123e4aca886a1bf6911c8268/setup.py'"'"'; __file__='"'"'/tmp/pip-install-oo12x6rg/flask_5bbe7300123e4aca886a1bf6911c8268/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-ecmqcogt
 cwd: /tmp/pip-install-oo12x6rg/flask_5bbe7300123e4aca886a1bf6911c8268/
 Complete output (6 lines):
 Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File "/tmp/pip-install-oo12x6rg/flask_5bbe7300123e4aca886a1bf6911c8268/setup.py", line 62
 print "Audit requires PyFlakes installed in your system."""
 ^
 SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Audit requires PyFlakes installed in your system.""")?
 ----------------------------------------
more ...
 Using cached Flask-0.6.1.tar.gz (413 kB)
 Using cached Flask-0.6.tar.gz (388 kB)
 Using cached Flask-0.5.2.tar.gz (369 kB)
 Using cached Flask-0.5.1.tar.gz (369 kB)
 Using cached Flask-0.5.tar.gz (369 kB)
 Using cached Flask-0.4.tar.gz (352 kB)
 Using cached Flask-0.3.1.tar.gz (339 kB)
 Using cached Flask-0.3.tar.gz (1.0 MB)
 Using cached Flask-0.2.tar.gz (13 kB)
 Using cached Flask-0.1.tar.gz (9.2 kB)
Collecting Werkzeug>=2.3.0
 Using cached Werkzeug-2.3.2-py3-none-any.whl (242 kB)
 Using cached Werkzeug-2.3.1-py3-none-any.whl (242 kB)
 Using cached Werkzeug-2.3.0-py3-none-any.whl (233 kB)
INFO: pip is looking at multiple versions of click to determine which version is compatible with other requirements. This could take a while.
Collecting Werkzeug>=2.2.2
 Using cached Werkzeug-2.2.3-py3-none-any.whl (233 kB)
 Using cached Werkzeug-2.2.2-py3-none-any.whl (232 kB)
Collecting Jinja2>=3.0
 Using cached Jinja2-3.1.1-py3-none-any.whl (132 kB)
 Using cached Jinja2-3.1.0-py3-none-any.whl (132 kB)
 Using cached Jinja2-3.0.3-py3-none-any.whl (133 kB)
 Using cached Jinja2-3.0.2-py3-none-any.whl (133 kB)
 Using cached Jinja2-3.0.1-py3-none-any.whl (133 kB)
 Using cached Jinja2-3.0.0-py3-none-any.whl (133 kB)
Collecting itsdangerous>=2.0
 Using cached itsdangerous-2.1.1-py3-none-any.whl (15 kB)
...

pip install reactpy
pip install Flask
pip install Flask-Cors
pip install flask-sock

runtime: python
# F1 = 2 workers (default), F2 = 4 workers
instance_class: F1
env: flex
# -w 2 sets gunicorn number of workers
# The number of workers you specify should match the instance class of your App Engine app:
entrypoint: gunicorn -b :$PORT -w 2 main:app
runtime_config:
 operating_system: "ubuntu22"
 runtime_version: "3.11"

from reactpy import component, html
from reactpy.backend.flask import configure
from flask import Flask
@component
def HelloWorld():
 return html.h1("Hello, world!")
app = Flask(__name__)
configure(app, HelloWorld)

Flask
reactpy
gunicorn
Flask-Cors
flask-sock

gcloud app deploy app.yaml