Problems with deploying a simple Flask app

1

I am trying to deploy a simple Flask app (just a hello world route for now) to. I know that I’ll need PyAudio for this project. So I already included it in the dependencies. Now when I deploy I get the following error message:

src/pyaudio/device_api.c:9:10: fatal error: portaudio.h: No such file or directory

If I understand it correctly portaudio is a C library that is needed by PyAudio. Which means I have to rely on portaudio being installed on the system I want to deploy to? Or alternatively use Docker (very limited knowledge)?

Any pointers into the right direction would be much appreciated!

Another thing that really confuses me is that, when I a generate a requirements.txt it adds Flask==2.3.1 as a dependency, which is current version. But the in the render.com logs I get

ERROR: Could not find a version that satisfies the requirement Flask==2.3.1 (from -r requirements.txt (line 9)) (from versions: 0.1, 0.2, 0.3, 0.3.1, 0.4, 0.5, 0.5.1, 0.5.2, 0.6, 0.6.1, 0.7, 0.7.1, 0.7.2, 0.8, 0.8.1, 0.9, 0.10, 0.10.1, 0.11, 0.11.1, 0.12, 0.12.1, 0.12.2, 0.12.3, 0.12.4, 0.12.5, 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 2.0.0rc1, 2.0.0rc2, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4)
ERROR: No matching distribution found for Flask==2.3.1 (from -r requirements.txt (line 9))
2

Hey !
unistall flask version ==2.3.1 and install the old version (from versions: 0.1, 0.2, 0.3, 0.3.1, 0.4, 0.5, 0.5.1, 0.5.2, 0.6, 0.6.1, 0.7, 0.7.1, 0.7.2, 0.8, 0.8.1, 0.9, 0.10, 0.10.1, 0.11, 0.11.1, 0.12, 0.12.1, 0.12.2, 0.12.3, 0.12.4, 0.12.5, 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 2.0.0rc1, 2.0.0rc2, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4) beacause it support only the above versiosn of flask

3

Hey,

If you’re encountering this issue, please simply update the Python version your Render service uses (see https://render.com/docs/python-version) with something that matches what you have locally. Flask 2.3.x dropped support for Python 3.7 which is what Render is using by default at the moment.

Regards.
Jérémy, Render Support

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