Getting Dict response - Boto3 - amazon-web-services

Question

I am trying to get the SnapshotId of the below output with no success. I can get the value of the AMI description and the value of AMI_ID.
{
'Images': [
{
'Architecture': 'i386'|'x86_64',
'CreationDate': 'string',
'ImageId': 'string',
'ImageLocation': 'string',
'ImageType': 'machine'|'kernel'|'ramdisk',
'Public': True|False,
'KernelId': 'string',
'OwnerId': 'string',
'Platform': 'Windows',
'ProductCodes': [
{
'ProductCodeId': 'string',
'ProductCodeType': 'devpay'|'marketplace'
},
],
'RamdiskId': 'string',
'State': 'pending'|'available'|'invalid'|'deregistered'|'transient'|'failed'|'error',
'BlockDeviceMappings': [
{
'DeviceName': 'string',
'VirtualName': 'string',
'Ebs': {
'Encrypted': True|False,
'DeleteOnTermination': True|False,
'Iops': 123,
'SnapshotId': 'string',
'VolumeSize': 123,
'VolumeType': 'standard'|'io1'|'gp2'|'sc1'|'st1'
},
'NoDevice': 'string'
},
],
'Description': 'string',
'EnaSupport': True|False,
'Hypervisor': 'ovm'|'xen',
'ImageOwnerAlias': 'string',
'Name': 'string',
'RootDeviceName': 'string',
'RootDeviceType': 'ebs'|'instance-store',
'SriovNetSupport': 'string',
'StateReason': {
'Code': 'string',
'Message': 'string'
},
'Tags': [
{
'Key': 'string',
'Value': 'string'
},
],
'VirtualizationType': 'hvm'|'paravirtual'
},
]
}
Using the following code:
import boto3
client = boto3.client('ec2', region_name='us-east-1')
def verifica_imagem(imagem):
amiresponse = client.describe_images(
Filters=[
{
'Name': 'description',
'Values': [
imagem,
]
},
],
DryRun=False
)
try:
data = str(amiresponse['Images'][0]['Description'])
ami_id = str(amiresponse['Images'][0]['ImageId'])
snapshot_id = str(amiresponse['Images'][0]['SnapshotId'])
except:
print "AMI not exists! Exiting...."
return 1
verifica_imagem('IMAGE_XXXXXXX')
I can't understand how to use the key of SnapshotId. I have tried:
snapshot_id = str(amiresponse['Images']['BlockDeviceMappings']['Ebs'][0]['SnapshotId']) but is not working too.

Answer 1

The value of Images and BlockDeviceMappings is an array and Ebs is a dict.
Use this to fetch the value of SnapshotId,
snapshot_id = amiresponse['Images'][0]['BlockDeviceMappings'][0]['Ebs']['SnapshotId']