python - I want to extract all the values that a class object holds

Question

I have an object Vm of Type <class 'azure.mgmt.compute.v2019_07_01.models._models_py3.VirtualMachine'> I want to iterate over this object by a loop so that I don't have to manually extract the values.

Yes I've tried isinstance to check whether the value is of type <class 'azure.mgmt.compute.v2019_07_01.models._models_py3.VirtualMachine'> and extract but in the next iteration it fails.

For example let's consider vm to be an object

• to access the vm size I will have to do vm.hardware_profile.vm_size
• and similarly to access os type value I will have to do this vm.storage_profile.os_disk.os_type

What I'm trying to achieve here is that if I pass the vm object it should return all the end values. Any help or tips are greatly appreciated and thanks in advance

The code that I have written

def iterdict(d):
    for k,v in d.items():        
        if isinstance(v, dict):
            iterdict(v)
        else:            
            print (k,":",v)

for vm in compute_client.virtual_machines.list_all():
    print(iterdict(vars(vm)))

And the output that i've been getting

name : arun-scheduler
type : Microsoft.Compute/virtualMachines
location : eastus
ml-scheduler : Test
stop_time : 2020-12-25 15:22:40.042295
plan : None
resources : None
identity : None
zones : None
hardware_profile : {'additional_properties': {}, 'vm_size': 'Standard_A1_v2'}
storage_profile : {'additional_properties': {}, 'image_reference': <azure.mgmt.compute.v2019_07_01.models._models_py3.ImageReference object at 0x000001AD6D5964C0>, 'os_disk': <azure.mgmt.compute.v2019_07_01.models._models_py3.OSDisk object at 0x000001AD6D596EB0>, 'data_disks': []}
additional_capabilities : None
os_profile : {'additional_properties': {}, 'computer_name': 'arun-scheduler', 'admin_username': 'xxxxxx', 'admin_password': None, 'custom_data': None, 'windows_configuration': None, 'linux_configuration': <azure.mgmt.compute.v2019_07_01.models._models_py3.LinuxConfiguration object at 0x000001AD6D596100>, 'secrets': [], 'allow_extension_operations': True, 'require_guest_provision_signal': True}
network_profile : {'additional_properties': {}, 'network_interfaces': [<azure.mgmt.compute.v2019_07_01.models._models_py3.NetworkInterfaceReference object at 0x000001AD6D596850>]}
diagnostics_profile : {'additional_properties': {}, 'boot_diagnostics': <azure.mgmt.compute.v2019_07_01.models._models_py3.BootDiagnostics object at 0x000001AD6D5966A0>}
availability_set : None
virtual_machine_scale_set : None
proximity_placement_group : None
priority : None

Output that I expect:

it should extract all the objects which are there in the Input

Answer 1

You can use recursion. Here I'm using hasattr to check if it's has __dict__ attribute(vars() method return the results of obj.__dict__).

def props(x):
    if hasattr(x, '__dict__'):
        res = {}
        for k, v in vars(x).items():
            if isinstance(v, list):
                res[k] = [props(e) for e in v if hasattr(e, '__dict__')]
            elif hasattr(v, '__dict__'):
                res[k] = props(v)
            else:
                res[k] = v
        return res

Example:

class A:
    def __init__(self, p, q):
        self.p = p
        self.q = q

class B:
    def __init__(self, x, y):
        self.x = x
        self.y = y

class C:
    def __init__(self, a, b, lst):
        self.a = a
        self.b = b
        self.lst = lst

Output:

>>> a = A(123, 'abc')
>>> b = B(a, {'xyz': 123})
>>> c = C(a, b, [B(a, 1), B(a, 2)])
>>> props(c)
{'a': {'p': 123, 'q': 'abc'},
 'b': {'x': {'p': 123, 'q': 'abc'}, 'y': {'xyz': 123}},
 'lst': [{'x': {'p': 123, 'q': 'abc'}, 'y': 1},
  {'x': {'p': 123, 'q': 'abc'}, 'y': 2}]}