Python 如何捕获 botocore 的 NoSuchKey 异常？
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How to capture botocore's NoSuchKey exception?
提问by theist
I'm trying to write "good" python and capture a S3 no such key error with this:
我正在尝试编写“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"
But NoSuchKey isn't defined and I can't trace it to the import I need to have it defined.
但是 NoSuchKey 没有定义，我无法将它追溯到我需要定义它的导入。
e.__class__is botocore.errorfactory.NoSuchKeybut from botocore.errorfactory import NoSuchKeygives an error and from botocore.errorfactory import *doesn't work either and I don't want to capture a generic error.
e.__class__是botocore.errorfactory.NoSuchKey但from botocore.errorfactory import NoSuchKey给出了错误并且from botocore.errorfactory import *也不起作用，我不想捕获一般错误。
回答by Jose Alban
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
回答by groner
Using botocore 1.5, it looks like the client handle exposes the exception classes:
使用 botocore 1.5，看起来客户端句柄暴露了异常类：
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"
回答by Randy
In boto3, I was able to access the exception in resource's meta client.
在 boto3 中，我能够访问资源的元客户端中的异常。
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")
回答by JeffSolo
I think the most elegant way to do this is in Boto3 is
我认为最优雅的方法是在 Boto3 中
session = botocore.session.get_session()
client = session.create_client('s3')
try:
client.get_object(Bucket=BUCKET, Key=FILE)
except client.exceptions.NoSuchKey:
print("no such key in bucket")
The documentation on error handling seems sparse, but the following prints the error codes this works for:
关于错误处理的文档似乎很少，但以下打印了适用于的错误代码：
session = botocore.session.get_session()
client = session.create_client('s3')
try:
try:
client.get_object(Bucket=BUCKET, Key=FILE)
except client.exceptions.InvalidBucketName:
print("no such key in bucket")
except AttributeError as err:
print(err)
< botocore.errorfactory.S3Exceptions object at 0x105e08c50 > object has no attribute 'InvalidBucketName'. Valid exceptions are: BucketAlreadyExists, BucketAlreadyOwnedByYou, NoSuchBucket, NoSuchKey, NoSuchUpload, ObjectAlreadyInActiveTierError, ObjectNotInActiveTierError
< botocore.errorfactory.S3Exceptions 对象在 0x105e08c50 > 对象没有属性“InvalidBucketName”。有效的例外是：BucketAlreadyExists、BucketAlreadyOwnedByYou、NoSuchBucket、NoSuchKey、NoSuchUpload、ObjectAlreadyInActiveTierError、ObjectNotInActiveTierError
