ec2_on_off.py

import boto3

def lambda_handler(event, context):
    # TODO implement
    ec2 = boto3.client('ec2')
    
    # on = "on"
    # off = "off"
    state = event.get("state")
    
    if state == True:
        ec2.start_instances(
            InstanceIds=[
            event.get("id")
            ]
        )
    elif state == False:
        ec2.stop_instances(
            InstanceIds=[
            event.get("id")
            ]
        )
    
    return {
         'statusCode': 200,
         'body': 'OK',
         'event': event
    }

# "event" argument in that case is receiving a dictionary like this {"id":"i-99999999999999999","state":false}
# where "id" is the intance id, and "state" is the state that we want of boolean type, that must be true or false, that function DOES NOT delete instances.