如何捕获botocore的NoSuchKey异常？

Question

我试图编写“好的”python并捕获一个S3 --没有这样的关键错误：

session = botocore.session.get_session()
client = session.create_client('s3')
try:
    client.get_object(Bucket=BUCKET, Key=FILE)
except NoSuchKey as e:
    print >> sys.stderr, "no such key in bucket"

但是NoSuchKey没有被定义，而且我无法将它跟踪到我需要定义的导入。

e.__class__是botocore.errorfactory.NoSuchKey，但是from botocore.errorfactory import NoSuchKey给出了一个错误，from botocore.errorfactory import *也不起作用，我不想捕获一个通用错误。

Answer 1

from botocore.exceptions import ClientError

try:
    response = self.client.get_object(Bucket=bucket, Key=key)
    return json.loads(response["Body"].read())
except ClientError as ex:
    if ex.response['Error']['Code'] == 'NoSuchKey':
        logger.info('No object found - returning empty')
        return dict()
    else:
        raise

Answer 2

使用botocore 1.5，客户端句柄似乎公开了异常类：

session = botocore.session.get_session()
client = session.create_client('s3')
try:
    client.get_object(Bucket=BUCKET, Key=FILE)
except client.exceptions.NoSuchKey as e:
    print >> sys.stderr, "no such key in bucket"

Answer 3

在boto3中，我能够访问资源的元客户机中的异常。

import boto3

s3 = boto3.resource('s3')
s3_object = s3.Object(bucket_name, key)

try:
    content = s3_object.get()['Body'].read().decode('utf-8')
except s3.meta.client.exceptions.NoSuchKey:
    print("no such key in bucket")