[Python] Convert Python dictionary to yaml

I have a dictionary, I am converting dictionary to yaml using yaml module in python. But Yaml is not converting properly.

output_data = {
'resources': [{
'type': 'compute.v1.instance',
'name': 'vm-created-by-deployment-manager',
'properties': {
'disks': [{
'deviceName': '$disks_deviceName$',
'boot': '$disks_boot$',
'initializeParams': {
'sourceImage': '$disks_initializeParams_sourceImage$'
},
'autoDelete': '$disks_autoDelete$',
'type': '$disks_type$'
}],
'machineType': '$machineType$',
'zone': '$zone$',
'networkInterfaces': [{
'network': '$networkInterfaces_network$'
}]
}
}]
}


I tried :

import yaml
f = open('meta.yaml', 'w+')
yaml.dump(output_data, f, allow_unicode=True)


I am getting meta.yaml file as following:

resources:
- name: vm-created-by-deployment-manager
properties:
disks:
- autoDelete: $disks_autoDelete$
boot: $disks_boot$
deviceName: $disks_deviceName$
initializeParams: {sourceImage: $disks_initializeParams_sourceImage$}
type: $disks_type$
machineType: $machineType$
networkInterfaces:
- {network: $networkInterfaces_network$}
zone: $zone$
type: compute.v1.instance


Here, {sourceImage: $disks_initializeParams_sourceImage$} and {network: $networkInterfaces_network$} are written like a dictionary. It means inner dictionary contents are not converting to yaml.

I also tried,

output_data = eval(json.dumps(output_data))
ff = open('meta.yaml', 'w+')
yaml.dump(output_data, ff, allow_unicode=True)


But getting same yaml file content.

How can I convert a nested dictionary into yaml in Python?

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