How to run Python script on lambda?

Running Python Scripts on AWS Lambda

Introduction

AWS Lambda is a fully managed compute service that allows developers to run code without provisioning or managing servers. It provides a scalable and secure way to deploy applications, and one of its key features is the ability to run Python scripts. In this article, we will explore how to run Python scripts on AWS Lambda.

Prerequisites

Before we dive into the process of running Python scripts on AWS Lambda, make sure you have the following:

• An AWS account
• An AWS Lambda function
• A Python interpreter installed on your local machine
• A Python script to run on AWS Lambda

Step 1: Create an AWS Lambda Function

To run a Python script on AWS Lambda, you need to create an AWS Lambda function. Here’s how:

• Log in to the AWS Management Console and navigate to the Lambda dashboard.
• Click on "Create function" and select "Author from scratch".
• Choose "Python" as the runtime and select the Python interpreter you want to use.
• Choose the handler for your function, which is usually index.handler.
• Set the handler to main (this is the entry point of your function).
• Set the environment variables, such as AWS_REGION and AWS_ACCESS_KEY_ID.
• Set the timeout to 15 minutes (you can adjust this value as needed).
• Click "Create function" to create your function.

Step 2: Write Your Python Script

Now that you have created your AWS Lambda function, you need to write your Python script. Here’s an example of a simple Python script that prints "Hello, World!" to the console:

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

Step 3: Upload Your Python Script to AWS S3

Before you can deploy your Python script to AWS Lambda, you need to upload it to an S3 bucket. Here’s how:

• Log in to the AWS Management Console and navigate to the S3 dashboard.
• Click on "Create bucket" and select "Public" as the bucket type.
• Set the bucket name and location.
• Click "Create bucket" to create your bucket.

Step 4: Upload Your Python Script to AWS Lambda

Once you have uploaded your Python script to S3, you can upload it to AWS Lambda. Here’s how:

• Log in to the AWS Management Console and navigate to the Lambda dashboard.
• Click on "Create function" and select "Upload code from file".
• Select the Python script you uploaded to S3 and click "Upload".
• Set the function name and environment variables, such as AWS_REGION and AWS_ACCESS_KEY_ID.
• Click "Create function" to create your function.

Step 5: Deploy Your Python Script to AWS Lambda

Once you have created your AWS Lambda function, you can deploy your Python script to it. Here’s how:

• Log in to the AWS Management Console and navigate to the Lambda dashboard.
• Click on "Create function" and select "Deploy from code".
• Select the Python script you uploaded to S3 and click "Deploy".
• Set the function name and environment variables, such as AWS_REGION and AWS_ACCESS_KEY_ID.
• Click "Deploy" to deploy your function.

Step 6: Test Your Python Script on AWS Lambda

Once you have deployed your Python script to AWS Lambda, you can test it. Here’s how:

• Log in to the AWS Management Console and navigate to the Lambda dashboard.
• Click on "Test" and select "Test function".
• Select the function name and environment variables, such as AWS_REGION and AWS_ACCESS_KEY_ID.
• Click "Test" to test your function.

AWS Lambda Function Structure

Here’s an example of what an AWS Lambda function structure might look like:

# main.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.py

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Environment Variables

Here’s an example of what an AWS Lambda function environment variables might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    AWS_REGION = 'us-west-2'

    AWS_ACCESS_KEY_ID = 'AKIAIOSFODNN7EXAMPLE'

    # Your function code here

    pass

# handler.zip

import boto3



def lambda_handler(event, context):

    AWS_REGION = 'us-west-2'

    AWS_ACCESS_KEY_ID = 'AKIAIOSFODNN7EXAMPLE'

    # Your function code here

    pass

AWS Lambda Function Code Snippets

Here’s an example of what an AWS Lambda function code snippet might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event, context):

    # Your function code here

    pass

AWS Lambda Function Code Examples (continued)

Here’s an example of what an AWS Lambda function code might look like:

# handler.py

import boto3



def lambda_handler(event, context):

    print("Hello, World!")

    return {

        'statusCode': 200,

        'statusMessage': 'OK'

    }

# handler.zip

import boto3



def lambda_handler(event