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What exception do I need to handle for the following code in case the file doesn't exist:

s3 = boto.resource("s3")
bucket = s3.Bucket('bucket')
obj = bucket.Object('index.html')

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The boto3 library is used to interact with Amazon Web Services (AWS), including their Simple Storage Service (S3). When using boto3 to access an S3 bucket or object, exceptions might be raised if the specified bucket or object doesn't exist, you don't have the correct permissions, etc.

In this particular code snippet, if the 'index.html' object doesn't exist in the 'bucket', the Object() call will not raise an exception. The object is lazily loaded, so an exception would not be raised until you try to perform an operation on the object, such as obj.download_file('local_path') or obj.get().

If you perform such an operation and the file doesn't exist, you would likely see a botocore.exceptions.ClientError. The error message would indicate a 404 error, and the error code would be 'NoSuchKey', indicating that the specified key doesn't exist in the bucket. Here's an example of how you might handle such an exception:

import botocore

s3 = boto3.resource("s3")
bucket = s3.Bucket('bucket')
obj = bucket.Object('index.html')

try:
    content = obj.get()['Body'].read().decode('utf-8')  # or any operation on `obj`
except botocore.exceptions.ClientError as e:
    if e.response['Error']['Code'] == "NoSuchKey":
        print("The object does not exist.")
    else:
        raise  # if it's a different kind of error, re-raise it

Remember, you would also need to handle other exceptions related to permissions (like AccessDenied), connectivity issues, and others depending on the operations you are performing with S3.