为什么我不能通过python boto3代码列出所有EC2属性?

import boto3
import csv
import pprint

ec2_cli=boto3.client(service_name='ec2')   #creating a ec2_cli object with client session
aws_regions = ec2_cli.describe_regions()['Regions']  
all_aws_regions = []
for each_region in aws_regions:
    #print(each_region['RegionName'])
    all_aws_regions.append(each_region['RegionName'])

#print (all_aws_regions)

file_open = open('ec2_inventory.csv', 'w', newline='')
data_obj=csv.writer(file_open)
data_obj.writerow(["S.no", "InstanceID", "ImageID", "Instance Lifecycle", "Instance Type", "Private DNS Name", "Private IP Address", "Root Device Name", "Root Device Type", "VPC ID"])

count = 1
for each_region in all_aws_regions:
    ec2_resource = boto3.resource(service_name='ec2', region_name = each_region)
    for each_inst_in_reg in ec2_resource.instances.all():
        #print (count,each_inst_in_reg.instance_id, each_inst_in_reg.`block_device_mapping.device_name`, each_inst_in_reg.block_device_mapping.status, each_inst_in_reg.block_device_mapping.volume_id, each_inst_in_reg.dns_name, each_inst_in_reg.image_id, each_inst_in_reg.instance_lifecycle, each_inst_in_reg.instance_state_name, each_inst_in_reg.instance_type, each_inst_in_reg.ip_address, each_inst_in_reg.owner_id, each_inst_in_reg.private_dns_name, each_inst_in_reg.private_ip_address, each_inst_in_reg.root_device_name, each_inst_in_reg.root_device_type, each_inst_in_reg.vpc_id, each_inst_in_reg.tag_key)
        data_obj.writerow([count,each_inst_in_reg.instance_id, each_inst_in_reg.image_id, each_inst_in_reg.instance_lifecycle, each_inst_in_reg.instance_type, each_inst_in_reg.private_dns_name, each_inst_in_reg.private_ip_address, each_inst_in_reg.root_device_name, each_inst_in_reg.root_device_type, each_inst_in_reg.vpc_id])
        count+=1

file_open.close()

我无法返回block_device_mapping的值。设备名称,块设备映射。excel文件中的设备状态。谁能告诉我我错过了什么。我可以从这些例子中看出。all()具有以下可调用的属性: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ec2.html