[Python] How to create a grammar to the following data using Pyparsing

I have data similar to YAML and need to create a grammar for it using Pyparsing. Like Python, Yaml's data scope is defined by the whitespace

data:

object : object_name
comment : this object is created first
methods:
method_name:
input:
arg1: arg_type
arg2: arg2_type
output:

methond2_name:
input:
output:
arg1 : arg_type


After parsing the above, it should output something similar to this:

{'comment': 'this object is created first',
'object': 'object_name',
'methods': {'method_name': {'input': {'arg1': 'arg_type', 'arg2': 'arg2_type'},
'output': None}, 'methond2_name': {'input': None, 'output': {'arg1': 'arg_type'}}}}


[EDIT] The data is similar to YAML but not exactly the same. So YAML Python parser is not able to parse it. I left of some of the details to make the example data simpler

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