s4cmd.py
def lookup(self, s3url):
    '''Get the s3 object with the S3 URL. Return None if not exist.'''
    try:
      return self.s3.head_object(Bucket=s3url.bucket, Key=s3url.path)
    except BotoClient.ClientError as e:
      if e.response['ResponseMetadata']['HTTPStatusCode'] == 404:
        return None
      else:
        raise e
def lookup(self, s3url):
    '''Get the s3 object with the S3 URL. Return None if not exist.'''
    try:
      return self.s3.head_object(Bucket=s3url.bucket, Key=s3url.path)
    except BotoClient.ClientError as e:
      if e.response['ResponseMetadata']['HTTPStatusCode'] == 404:
        return None
      else:
        raise e
Get the s3 object with the S3 URL. Return None if not exist.