Library not working when included with AWS Layers

[himanshu219]

Reproduction Steps

1> Create a Lambda Function(https://docs.aws.amazon.com/lambda/latest/dg/getting-started-create-function.html)
2> Create a layer and associate it with your lambda created in Step 1(https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html). The purpose of layers is to have a shared library across multiple AWS Lambda functions. So here I am putting the future-fstrings library as a part of my zip file which is uploaded as AWS layer.

When I run the function I get the following error
[ERROR] Runtime.UserCodeSyntaxError: Syntax error in module 'main': unknown encoding for '/var/task/main.py': future_fstrings Traceback (most recent call last): File "None" Line None None

Assuming main.py contains my lambda function code
If I include the future_strings in same folder as my code then it works.
AWS Lambda puts the shared libraries in /opt/ folder and I am dynamically adding opt directory to sys path sys.path.insert(0, '/opt') Doing this way it throws error.

I do not know the internals how the library converts and when does the conversion code triggers but my hunch is I am doing something wrong here.

[asottile]

you're going to have to provide a reproduction, I have no idea what "AWS Layers" is

[asottile]

ah, since lambda doesn't work with site packages, you'll need to manually initialize future-fstrings in a wrapper script

you can do so via import future_fstrings; future_fstrings.register() -- I'll add something to the README