Python program to list all ec2 instances in a region using boto3

list_ec2_instances.py

import boto3

access_key = "XXXXXXXXXXXXXXXXXX"
secret_key = "XXXXXXXXXXXXXXXXXX"

region = 'us-east-1'
client = boto3.client('ec2', aws_access_key_id=access_key, aws_secret_access_key=secret_key,
                                  region_name=region)

conn = boto3.resource('ec2', aws_access_key_id=access_key, aws_secret_access_key=secret_key, region_name=region)
instances = conn.instances.filter()
for instance in instances:
    if instance.state["Name"] == "running":
       print (instance.id, instance.instance_type, region, instance.tags)