s3cat implementation in python

s3cat.py

#!/usr/bin/env python3

"""
Yet-another s3cat implementation.
streams files out of s3.

Requires boto3
> pip3 install boto3

Will use whatever your default credentials are locally (i.e. whatever you set up for awscli)
"""

import boto3, argparse, urllib.parse, sys

if __name__ == '__main__':
    client = boto3.client('s3')
    parser = argparse.ArgumentParser(usage="Print one or more s3 objects to the terminal")
    parser.add_argument("url", help="s3 url(s) to cat.  If ", nargs='+')
    
    options = parser.parse_args()
    for s3_url in options.url:
        parsed_s3_url = urllib.parse.urlparse(s3_url)
    
        if parsed_s3_url.scheme != 's3':
            raise Exception("URL scheme must be s3")
            
        
        if len(parsed_s3_url.path) <= 1:
            raise Exception("s3 URL must have a path (the key of the s3 object to cat)")
            
        
        bucket = parsed_s3_url.netloc
        obj_key = parsed_s3_url.path[1:]
            
        obj = client.get_object(Bucket=parsed_s3_url.netloc, Key=obj_key)
        
        for chunk in obj['Body'].iter_chunks():
            sys.stdout.buffer.write(chunk)