How can I import the boto3 ssm ParameterNotFound exception?

Question

I would like to import the exception that occurs when a boto3 ssm parameter is not found with get_parameter. I'm trying to add some extra ssm functionality to the moto library, but I am stumped at this point.

>>> import boto3 >>> ssm = boto3.client('ssm') >>> try: ssm.get_parameter(Name='not_found') except Exception as e: print(type(e)) <class 'botocore.errorfactory.ParameterNotFound'> >>> from botocore.errorfactory import ParameterNotFound ImportError: cannot import name 'ParameterNotFound' >>> import botocore.errorfactory.ParameterNotFound ModuleNotFoundError: No module named 'botocore.errorfactory.ParameterNotFound'; 'botocore.errorfactory' is not a package

However, the Exception cannot be imported, and does not appear to exist in the botocore code. How can I import this exception?

wscourge · Accepted Answer · 2018-06-21 04:21:38Z

38

mc = boto3.client('ssm') try: ... except mc.exceptions.ParameterNotFound: ...

edited Jun 21, 2018 at 4:21

wscourge

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answered Jun 21, 2018 at 0:10

gladiatr72

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1 Comment

Shawn Over a year ago

When I try this and it reaches the except line it generates an exception stating exceptions must derive from the base class so I question if this is really valid

charlax · Accepted Answer · 2021-04-13 09:43:24Z

20

From Botocore Error Handling

import boto3 from botocore.exceptions import ClientError ssm = boto3.client('ssm') try: ssm.get_parameter(Name='not_found') except ClientError as e: print(e.response['Error']['Code'])

edited Apr 13, 2021 at 9:43

charlax

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answered Sep 5, 2017 at 21:42

helloV

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2 Comments

fIwJlxSzApHEZIl Over a year ago

This isn't difficult to understand from a code perspective. What's difficult to understand from a design perspective is that you can't directly import or name an error from its callstack name in boto3. Neither import botocore.errorfactory.ResourceNotFoundException or except botocore.errorfactory.ResourceNotFoundException work. But both are what one would immediately want to try after receiving said error. Puzzling.

charlesreid1 Over a year ago

Also see this answer for more info about the structure of the ClientError response: stackoverflow.com/a/33663484

sam2426679 · Accepted Answer · 2024-08-20 19:58:00Z

Below is a wrapper function so that you have a pythonic Exception

import boto3 from botocore.exceptions import ClientError class ParameterNotFound(Exception): pass def get_parameter(ssm, *args, **kwargs): try: return ssm.get_parameter(*args, **kwargs) except ClientError as exc: if exc.response['Error']['Code'] == 'ParameterNotFound': raise ParameterNotFound from exc raise get_parameter(boto3.client('ssm'), Name='/my/param')

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