Get KeyValue from Cloudformation Output with Python Boto3

Question

I am trying to use Boto3 to print out the instance private IP address from a Cloudformation stack Output. It should be a fairly straightforward process. However my code just refuse to work.

The Outputs section of the describe_stacks response is below:

{'OutputKey': 'EC2IP', 'OutputValue': '192.168.10.10', 'Description': 'Web Server IP Address'},
{'OutputKey': 'ImageID', 'OutputValue': 'ami-0888888888888', 'Description': 'Web Server Image ID'}

I have tested my code below. It prints out nothing.

import boto3
cf_client = boto3.client('cloudformation')
stackname = 'test-instance-stack'

response = cf_client.describe_stacks(StackName=stackname)
outputs = response["Stacks"][0]["Outputs"]
   for output in outputs:
        keyName = output["OutputKey"]
        if keyName is "EC2IP":
            print(output["OutputValue"])

Though if I try

print(keyName)

It does printout EC2IP and ImageID So keyName in this case should match EC2IP and then print out the IP. But somehow I get nothing...

Here is a explanation for the difference bewteen == and is. The == operator compares the values of both the operands and checks for value equality. Whereas is operator checks whether both the operands refer to the same object or not. — Tomking Chen
– Tomking Chen, Commented Nov 2, 2019 at 6:05

John Rotenstein · Accepted Answer · 2019-11-02 05:37:05Z

4

Instead of:

if keyName is "EC2IP":

Use:

if keyName == "EC2IP":

answered Nov 2, 2019 at 5:37

John Rotenstein

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