Unable to import module 'lambda_function': No module named 'pymongo'

Question

I have followed this guide last year to build my AWS python archive and it was working.

Today i have automated my code deployment and it was not working (i am using shutil.make_archive("package", 'zip', root_dir=path, base_dir="package/", verbose=True) instead of the zip -r package.zip package/ command now.

But when i start doing all these steps manually again and deploy (without the automated code) it’s not working anymore.

Here is what my folders look like :

The only thing that has changed since the last time it was working is the pymongo version which was 3.12 instead of 4.3.3.

My handler is :

def lambda_handler(event, context):
    print(event)

The error i am getting from CloudWatch :

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

What am i doing wrong ?

EDIT :

I have found an old dependency package that is working, but that is using more than just pymongo[srv] so i will check what may be different but the error comes from the dependencies.

Asked By: Tom3652

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Source

Answer 1

I would strongly advise that you use a Lambda Layer to import external modules, ensuring your packaged components are at the root of the project and not within a directory named package.

Add External Python Libraries to AWS Lambda using Lambda Layers
https://www.linkedin.com/pulse/add-external-python-libraries-aws-lambda-using-layers-gabe-olokun

Answered By: Lee Hannigan

Answer 2

For lambda to find your external dependency, all your dependency must be inside audio-handler folder and not package. By default, lambda looks for dependency in the root directory.

audio-handler
 |-bson
 |-pymongo
 .
 .
 .
 |-lambda_function.py

Here is the video on how to create your deployment package and deploy it on aws lambda
https://www.youtube.com/watch?v=Jtlxf_kn5zY

Answered By: Manish sah

Unable to import module 'lambda_function': No module named 'pymongo'

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