How to update YAML file with Ansible

Recently I had a task to update YAML file with ansible. I thought that there is already an Ansible module that does it, but I couldn't find any.

Anyway it turned out that it is quite simple to do it with python.
You just have to create a python file which you execute in Ansible.
Here is the python file:

import collections
import io
import sys
import yaml

filename = str(sys.argv[1])
snippet = yaml.load(sys.argv[2])

with io.open(filename, 'r', encoding='utf8') as f:
   yaml_dict = yaml.load(f) or {}

def deep_update(source, overrides):
    for key, value in overrides.iteritems():
        if isinstance(value, collections.Mapping) and value:
            returned = deep_update(source.get(key, {}), value)
            source[key] = returned
        else:
            source[key] = overrides[key]
    return source   

deep_update(yaml_dict, snippet)
with io.open(filename, 'w', encoding='utf8') as f:
   yaml.dump(yaml_dict, f, default_flow_style=False, allow_unicode=True) 

You can find the code here.