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Example using boto3 to list running EC2 instances
import boto3
ec2 = boto3.resource('ec2')
def lambda_handler(event, context):
# create filter for instances in running state
filters = [
{
'Name': 'instance-state-name',
'Values': ['running']
}
]
# filter the instances based on filters() above
instances = ec2.instances.filter(Filters=filters)
# instantiate empty array
RunningInstances = []
for instance in instances:
# for each instance, append to array and print instance id
RunningInstances.append(instance.id)
print instance.id
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