Lambda Update EC2 Tags

Update EC2 Tags using Python (Lambda function)

Simple example demonstrating Python's ability to lookup and update Tags.
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import json
import boto3
from datetime import date

# I don't like the dictionary returned by AWS, so I convert it to
# Key:Value pairs
def parse_tags(tag_dict):
    my_dict = {}
    for tag in tag_dict:
        for item in tag:
            if item == 'Key':
                key = tag[item]
            else:
                value = tag[item]
        my_dict[key]= value
    return my_dict

def lambda_handler(event, context):
    today = date.today()
    year = today.strftime("%Y")
    month = today.strftime("%m")
    day = today.strftime("%d")
    #Declare object for all of our ec2 objects in this region
    ec2 = boto3.resource('ec2', region_name='us-east-2')
    #give me all the instances
    instances = ec2.instances.all()
    print('Instances')
    for ins in instances:
        print("Instance Id: ", ins.id)
        ins_tag_dict = {}
        if(ins.tags != None):
            ins_tag_dict = parse_tags(ins.tags)
        #get function of dictionary return None if not found
        name_tag = ins_tag_dict.get('Name')
        if(name_tag == None):
            #Create a name tag for this object
            name_tag = 'Sam'
            ins.create_tags(Tags=[{'Key':'Name','Value': name_tag}])
        #Give me all the volumes for this instance
        volumes = ins.volumes.all()
        for vol in volumes:
            vol_tag_dict = {}
            if(vol.tags != None):
                vol_tag_dict = parse_tags(vol.tags)
            print("Volume Id: ",vol.id)
            # attachment (LIST) has following values:
            ## [{'AttachTime': datetime.datetime(2018, 12, 3, 5, 11, 5, tzinfo=tzlocal()), 'Device': '/dev/xvda', 'InstanceId': 'i-XXXXXXXX', 'State': 'attached', 'VolumeId': 'vol-XXXXXXX', 'DeleteOnTermination': True}]
            # Convert this LIST to DICT
            vol_att_dict = vol.attachments[0]
            vol_device = vol_att_dict.get('Device')
            vol_name_tag = vol_tag_dict.get('Name')
            if(vol_name_tag == None):
                #Create a name tag for this object
                vol_name_tag = name_tag + '_' + vol_device
                vol.create_tags(Tags=[{'Key':'Name','Value': vol_name_tag}])
        #Give ENI names of the EC2 Instance if they are missing name tag
        net_interfaces = ins.network_interfaces
        for eni in net_interfaces:
            print("ENI Id: ",eni.id)
            eni_tag_dict = {}
            if(eni.tag_set != None):
                eni_tag_dict = parse_tags(eni.tag_set)
            eni_name_tag = eni_tag_dict.get('Name')
            if(eni_name_tag == None):
                eni.create_tags(Tags=[{'Key':'Name','Value':name_tag}])
    print('Volumes not in use')
    #give me all the volumes that are not in use
    volumes = ec2.volumes.filter(Filters=[{'Name': 'status', 'Values': ['available']}])
    for vol in volumes:
        print("Volume Id: ",vol.id)
        vol_tag_dict = {}
        if(vol.tags != None):
            vol_tag_dict = parse_tags(vol.tags)
        vol_mode_tag = vol_tag_dict.get('Mode')
        if(vol_mode_tag == None):
            #If Mode tag does not exist, make it Auto mode
            vol.create_tags(Tags=[{'Key':'Mode','Value':'Auto'}])
        vol_expire_tag = vol_tag_dict.get('Expire')
        if(vol_expire_tag == None):
            #If Expire tag does not exist then set it to 7 day from now
            ## we'd have a different function to do the actual cleanup
            new_day = str(int(day) + 7).zfill(2)
            expireDate = year + month + new_day
            vol.create_tags(Tags=[{'Key':'Expire','Value': expireDate}])
    return {
        'statusCode': 200,
        'body': json.dumps('Finished!')
    }