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  4. AWS Lambda: Programatically Create a Python ‘Hello World’ Function

AWS Lambda: Programatically Create a Python ‘Hello World’ Function

In this post we take a look at how to quickly create a Python function using AWS Lambda, including their configurations and uploading them to the service.

By 
Mark Needham user avatar
Mark Needham
·
Apr. 04, 17 · Tutorial
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I’ve been playing around with AWS Lambda over the last couple of weeks and I wanted to automate the creation of these functions and all their surrounding config.

Let’s say we have the following Hello World function:

def lambda_handler(event, context):
    print("Hello world")


To upload it to AWS, we need to put it inside a ZIP file, so let’s do that:

$ zip HelloWorld.zip HelloWorld.py
$ unzip -l HelloWorld.zip 
Archive:  HelloWorld.zip
  Length     Date   Time    Name
 --------    ----   ----    ----
       61  04-02-17 22:04   HelloWorld.py
 --------                   -------
       61                   1 file


Now we’re ready to write a script to create our AWS Lambda function.

import boto3

lambda_client = boto3.client('lambda')

fn_name = "HelloWorld"
fn_role = 'arn:aws:iam::[your-aws-id]:role/lambda_basic_execution'

lambda_client.create_function(
    FunctionName=fn_name,
    Runtime='python2.7',
    Role=fn_role,
    Handler="{0}.lambda_handler".format(fn_name),
    Code={'ZipFile': open("{0}.zip".format(fn_name), 'rb').read(), },
)


[your-aws-id] needs to be replaced with the identifier of our AWS account. We can find that out be running the following command against the AWS CLI:

$ aws ec2 describe-security-groups --query 'SecurityGroups[0].OwnerId' --output text
123456789012


Now we can create our function:

$ python CreateHelloWorld.py

2017 04 02 23 07 38

And if we test the function, we’ll get the expected output:

2017 04 02 23 02 59


AWS AWS Lambda Python (language)

Published at DZone with permission of Mark Needham, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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  • Managing AWS Managed Microsoft Active Directory Objects With AWS Lambda Functions
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  • Alexa Skill With Python

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