Because I thought that it might be useful for me in the future. I might have some misses here and there, or not very efficient, but if you're like me and have 40 organizations.. then...
 
 
dashboard = meraki.DashboardAPI(x_cisco_meraki_api_key, suppress_logging=True)
organizations = dashboard.organizations.getOrganizations()
SWITCH = True # Set to True if you want to display the vlans from MX
APPLIANCE = True # set to True if you want to display the vlans from MS
print("Organization,Network,Type,Subnet,Vlan name,Vlan ID")
for org in organizations:
    networks = dashboard.organizations.getOrganizationNetworks(organizationId=org["id"])
    devices = dashboard.organizations.getOrganizationDevices(organizationId=org["id"], productTypes=["appliance", "switch"])
    for network in networks:
        if "appliance" in network["productTypes"] and APPLIANCE is True:
            networkSettings = dashboard.networks.getNetworkSettings(networkId=network["id"])
            try:
                singleVlan = dashboard.appliance.getNetworkApplianceSingleLan(networkId=network["id"])
                print(f"{org['name']},{network['name']},MX,{singleVlan['subnet']},,1")
            except Exception as e:
                pass
            try:
                vlans = dashboard.appliance.getNetworkApplianceVlans(networkId=network["id"])
                for vlan in vlans:
                    print(f"{org['name']},{network['name']},MX,{vlan['subnet']},{vlan['name']},{vlan['id']}")
            except Exception as e:
                pass
                
        if "switch" in network["productTypes"] and SWITCH is True:
            switchStacks = dashboard.switch.getNetworkSwitchStacks(networkId=network["id"])
            switches = [switch for switch in devices if switch["productType"] == "switch" and switch["networkId"] == network["id"]]
            for stack in switchStacks:
                for serial in stack['serials']:
                    for index, switch in enumerate(switches):
                        switches.pop(index)
                stackVlans = dashboard.switch.getNetworkSwitchStackRoutingInterfaces(networkId=network["id"], switchStackId=stack["id"])
                for stackVlan in stackVlans:
                    print(f"{org['name']},{network['name']},MS-stack,{stackVlan['subnet']},{stackVlan['name']},{stackVlan['vlanId']}")
            for switch in switches:
                switchVlans = dashboard.switch.getDeviceSwitchRoutingInterfaces(serial=switch["serial"])
                for switchVlan in switchVlans:
                    print(f"{org['name']},{network['name']},MS-nonstack,{switchVlan['subnet']},{switchVlan['name']},{switchVlan['vlanId']}")