CODEWITHSUNDEEP
pythonpython-3.xamazon-web-servicesimportaws-lambda
Ashu
Ashu

Reputation: 343

No Module find in Deployment Package for AWS Lambda

I installed ujson package in virtualenv

(mylambdaenv) C:\Users\xyz\lambda_code\mylambdaenv>pip install ujson
    Collecting ujson
      Using cached ujson-4.0.2-cp36-cp36m-win_amd64.whl (43 kB)
    Installing collected packages: ujson
    Successfully installed ujson-4.0.2

But While running the package it is failing with error no module ujson. I have one file in my package as ujson.cp36-win_amd64 & one folder ujson-4.0.2.dist-info. Is it not readable by AWS Lambda? Please help to resolve Error

import ujson
ModuleNotFoundError: No module named 'ujson'

Upvotes: 2

Views: 1062

Answers (1)

Marcin
Marcin

Reputation: 238647

The best way, in my experience, to add dependencies to lambda functions is through lambda layers and the use of docker tool described in the recent AWS blog:

Thus you can add ujson to your function as follows:

  1. Create empty folder, e.g. mylayer.

  2. Go to the folder and create requirements.txt file with the content of

echo ujson > ./requirements.txt
  1. Run the following docker command:

The command will create layer for python3.8:

docker run -v "$PWD":/var/task "lambci/lambda:build-python3.8" /bin/sh -c "pip install -r requirements.txt -t python/lib/python3.8/site-packages/; exit"
  1. Archive the layer as zip:
zip -9 -r mylayer.zip python

  1. Create lambda layer based on mylayer.zip in the AWS Console. Don't forget to specify Compatible runtime to python3.8.

  2. Add the the layer created in step 6 to your function.

  3. Test the layer in lambda using the following lambda function:

import ujson

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

I tested this and it the function and layer work correctly:

['__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', '__version__', 'decode', 'dump', 'dumps', 'encode', 'load', 'loads']

p.s.

The above steps were executed on linux. If you don't have one, you can create EC2 linux instance and do the steps there if you wish.

Upvotes: 1

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