How to list Azure vms using python?

First, you need to follow the section Register your client application with Azure AD of Azure offical document Azure REST API Reference to register an application with Azure AD on Azure portal for getting the required parameters client_id and secret for Authentication to list VMs.

And, you continue to get the other required parameters subscription_id and tenant_id.

Then, to create a virtual environment in Python to install Azure SDK for Python via pip install azure or just install Azure Compute Management for Python via pip install azure-mgmt-compute.

Here is my sample code.

from azure.common.credentials import ServicePrincipalCredentials
from azure.mgmt.compute import ComputeManagementClient

credentials = ServicePrincipalCredentials(
    client_id='<your client id>',
    secret='<your client secret>',
    tenant='<your tenant id>'
)

subscription_id = '<your subscription id>'
client = ComputeManagementClient(credentials, subscription_id)

If just list VMs by resource group, to use function list(resource_group_name, custom_headers=None, raw=False, **operation_config) as the code below.

resource_group_name = '<your resource group name>'
vms_by_resource_group = client.virtual_machines.list(resource_group_name)

Or you want to list all VMs in your subscription, to use function list_all(custom_headers=None, raw=False, **operation_config) as the code below.

all_vms = client.virtual_machines.list_all()

As references, there are two SO threads I think which may help for understanding deeper: How to get list of Azure VMs (non-classic/Resource Managed) using Java API and Is it anyway to get ftpsState of azure web app (Azure Function app) using Python SDK?.

Hope it helps.