Unable to import module in AWS Lambda (Python)

Question

I have a python script named foo.py. It has a lambda handler function defined like this:

def handler(event, context):
    for record in event['Records']:
        bucket = record['s3']['bucket']['name']
        key = record['s3']['object']['key']
        download_path = '/tmp/{}.gz'.format(key)
        csv_path = '/tmp/{}.csv'.format(key)
        ... proceed to proprietary stuff

This is in a zip file like so:

-foo.zip
    -foo.py
    -dependencies

I have uploaded this zip file to AWS Lambda and configured an AWS Lambda Function to run foo.handler. However, every time I test it, I get "errorMessage": "Unable to import module 'foo'".

Any ideas what might be going on here?

stat --format '%a' foo.py shows 664

Where are you importing foo.py? I don't understand why you want to import your "main" Lambda module. — stdunbar
– stdunbar, Commented Feb 27, 2017 at 20:20

John Chrysostom · Accepted Answer · 2017-03-08 13:17:36Z

4

So, I was importing psycopg2 in my lambda function, which requires libpq.so, which installs with Postgres. Postgres isn't installed in the lambda environment, so importing psycopg2 failed, which meant that, by extension, Amazon's import of my lambda function also failed. Not a very helpful error message, though.

Thankfully, somebody's built a version of psycopg2 that works with AWS lambda: https://github.com/jkehler/awslambda-psycopg2

answered Mar 8, 2017 at 13:17

John Chrysostom

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