always growing list of aws boto3 helper functions in python3

aws_helpers.py

import boto3
import urllib.request
import re
from urllib.error import URLError
from subprocess import run, PIPE

def get_instance_id(timeout=5):
    try:
        return urllib.request.urlopen(
            "http://169.254.169.254/latest/meta-data/instance-id",
            timeout=timeout
        ).read().decode()
    except URLError:
        return None

def get_instance_name(region="us-east-1"):
    ec2 = boto3.resource("ec2", region)
    instance = ec2.Instance(get_instance_id())
    for t in instance.tags:
        for k in t.keys():
            if t[k] == "Name":
                return t["Value"]
    return None

def return_ec2_region():
    avregex = r"^(us|eu|ap|sa|cn)-([a-zA-Z-]{4,10})-(\d)(\w{0,2})$"
    avz = urllib.request.urlopen("http://169.254.169.254/latest/meta-data/placement/availability-zone/").read().decode()
    return "-".join(re.search(avregex, avz).groups()[:3]) if re.match(avregex, avz) else None

def aws_file_size(s3_path, oom="gb", profile=None):
    output = run(
        """aws s3 ls {profile} {s3_path}""".format(
            profile="--profile {}".format(profile) if profile else "", 
            s3_path=s3_path
        ),
        shell=True,
        stdout=PIPE
       ).stdout.decode().split("\n")
    output.pop()
    
    total_bytes = sum([int(p.split()[2]) for p in output])
    
    if oom == "mb":
        size = total_bytes/1e6
    elif oom == "kb":
        size = total_bytes/1e3
    elif oom == "tb":
        size = total_bytes/1e12
    else:
        size = total_bytes/1e9
    
    print("Found {} files, totaling {:.02f} {}(s).".format(len(output), size, oom))

    return size