script.py

import boto3
from botocore.exceptions import ClientError

def check_ec2_and_s3_instances():
    tag_key = 'Env'
    input_tag_value = input('Enter tag values separated by commas:\n\n')
    tag_values = input_tag_value.split(',')
    check_ec2_instances(tag_key, tag_values)
    check_s3_instances(tag_key, tag_values)
    

def check_ec2_instances(tag_key, tag_values):
    ec2 = boto3.resource('ec2')
    # get a list of all instances
    all_instances = ec2.instances.all()
    print('\n\n\nChecking EC2 instances:\n\n\n')

    # get instances with filter of running + with tag `Name`
    for tag_value in tag_values:
        instances = ec2.instances.filter(Filters=[{'Name': 'tag:' + tag_key, 'Values': [tag_value]}])
        instances_not_match = [not_match.id for not_match in all_instances if not_match.id not in [instance.id for instance in instances]]

    print('EC2 Instances that do not match with Tag Values:\n\n',instances_not_match)

def check_s3_instances(tag_key, tag_values):
    print('\n\n\nChecking S3 Buckets:\n\n\n')
    s3 = boto3.client('s3')

    matching_buckets = []
    notmatching_buckets = []
    nottaged_buckets = []

    for bucket in s3.list_buckets()['Buckets']:
        bucketName = bucket['Name']
        location = s3.get_bucket_location(Bucket=bucketName)['LocationConstraint']
        if location == None:
            try:
                tags = s3.get_bucket_tagging(Bucket=bucketName)['TagSet']
                for tag in tags:
                    for tag_value in tag_values:
                        if tag['Key'] == tag_key and tag['Value'] == tag_value:
                            if bucketName not in matching_buckets:
                                matching_buckets.append(bucketName)
                                notmatching_buckets.remove(bucketName)
                        elif tag['Key'] == tag_key and tag['Value'] != tag_value and bucketName not in matching_buckets:
                            if bucketName not in notmatching_buckets:
                                notmatching_buckets.append(bucketName)
            except ClientError:
                nottaged_buckets.append(bucketName)
    print('S3 Buckets that match to Tag Values', tag_values, 'are: ', matching_buckets)
    print('S3 Buckets that do not match to Tag Values', tag_values, 'are: ', notmatching_buckets)
    print('S3 Buckets that do not have Tags are: ', nottaged_buckets)

check_ec2_and_s3_instances()