S3 test if an object exists

s3-object-exists.py

#! /usr/bin/env python3

import boto3
import sys

s3client = boto3.client('s3')

def s3_object_exists(bucket, key):
  ret = False
  try:
    metadata = s3client.head_object(Bucket=bucket, Key=key)
    ret = True
  except s3client.exceptions.NoSuchKey as e:
    print(f"nosuchkey: {e}")
    pass
  except s3client.exceptions.NoSuchBucket as e:
    print(f"nosuchbucket: {e}")
    pass
  except Exception as e:
    print(f"Exception {type(e).__name__}: {e}")
  return ret

(bucket, key) = sys.argv[1:3]
ret = s3_object_exists(bucket, key)
print(f"{ret}: {bucket}, {key}")