Getting KeyError when trying to access key in a dictionary

I’m using Boto3 of AWS to describe the security group and trying to access the FromPort key for all the security groups available in a particular region. But when I’m trying to do so it will list some of the ports and then throws the KeyError.

Code:

import boto3
    
client = boto3.client('ec2')
response = client.describe_security_groups()

for sg in response['SecurityGroups']:
    for ip in sg['IpPermissions']:
        print(ip['FromPort'])

Output:

80
5432
22
22
3622
8443
3
80
3622
8080
5432
22
8443
443
Traceback (most recent call last):
  File ".a.py", line 8, in <module>
    print(ip['FromPort'])
KeyError: 'FromPort'

Answer

Your code is assuming that the entry you are trying to print is always in the response you get back. You can make the code more robust like this:

Replace

ip['FromPort'] 

with

ip.get('FromPort','((missing))')