Unable to import pydantic in lambda function

Question

I am trying to import pydantic to a lambda via a lambda layer

and I keep getting this error

[ERROR] Runtime.ImportModuleError: Unable to import module 'main': No module named 'pydantic' Traceback (most recent call last):

The lambda uses python 3.9,Architecture x86_64, I have tried these commands separately :

docker run -i -v $(pwd)/layer:/app -w /app --entrypoint /bin/bash public.ecr.aws/lambda/python:3.9 -c "pip3 install --target ./python -r requirements.txt"
pip3 install --target layer/python -r requirements.txt --upgrade
docker run -i -v $(pwd)/layer:/app -w /app --user $(id -u):$(id -g) --entrypoint /bin/bash python:3.10.13-slim-bullseye -c "pip3 install --target ./python -r requirements.txt --upgrade"
pip install -r requirements.txt --python-version 3.9 --platform manylinux2014_x86_64 --target layer/python --only-binary=:all:

and then compress the packages zip -r layer.zip layer/python and upload the layer and import it in the lambda

and I keep getting this error

[ERROR] Runtime.ImportModuleError: Unable to import module 'main': No module named 'pydantic' Traceback (most recent call last):

Please provide the requirements.txt and the code snippet where you perform these imports. — TLeitzbach
– TLeitzbach, Commented Feb 1, 2024 at 8:06
using this fixed the issue with updating the lambda python version to 3.9 pip install -r requirements.txt --python-version 3.9 --platform manylinux2014_x86_64 --target layer/python --only-binary=:all: as well as using a zip file that includes only python directory instead of layer/python — AR98
– AR98, Commented Feb 3, 2024 at 1:08

AR98 · Accepted Answer · 2024-02-03 01:11:37Z

1

The following fixed the issue

using pip install -r requirements.txt --python-version 3.9 --platform manylinux2014_x86_64 --target layer/python --only-binary=:all:
make sure that the lambda python version is 3.9
when creating the zip file it should be python/pydantic so it can be imported from the layer correctly

answered Feb 3, 2024 at 1:11

AR98

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