Upgrading from Python 3.7 to 3.9

Python
1

Hi,

I am working on upgrading some applications we have that are running in AWS Lambda docker images from python 3.7 to python 3.9. The docker images are listed as below:

  • Python 3.7
    • public.ecr.aws/lambda/python:3.7
  • Python 3.9
    • public.ecr.aws/lambda/python:3.9

Previously we were using opencv-python==4.3.0.36, however python 3.9 does not support this version so I had to upgrade to the next closest version, which was 4.3.0.38. When doing this upgrade, opencv now compiles from source when trying to pip install.

I am not sure why it is not choosing the appropriate whl file since the linux distro the docker image uses didn’t change (to my knowledge).

Hoping for insight.

Thanks!
Logan Elkins

2

don’t depend on so old a version.

those old versions don’t have binaries for python 3.9 because python 3.9 wasn’t available then.

none of the files for 4.3.0.38 mention abi3 so they aren’t forward-compatible.

every time pip tries to build from source, you’re trying to match versions that don’t match.

you must pick a newer version. while you’re at it, pick the current release.

3

Gotcha. We also depend on a large number of other packages so our dependency trees are quite tightly knit but I will do my best to upgrade to a newer version.

Thank you!

4

if you use aruco, perhaps stop at 4.5.something because after that is when that module was severely manhandled. the dust seems to have settled now though.