[Q] How to compose, serialize, and emit in PyYAML?

Hi,
I'm investigating PyYAML 3.05 and have some questions.

Q1. How to compose nodes from event list?
Q2. How to serialize node into event list?
Q3. How to emit event list into stram?

example:
--------------------
import yaml

string = """
- abc
- 123
- yes
"""

## parse string and get event list
events = [ event for event in yaml.parse(string) ]

### compose nodes from event list
node = ??????   # yaml.compose(string) is not what I want

## construct Python data from nodes
constructor = yaml.constructor.Constructor()
data = constructor.construct_document(node)

## convert data into node
representer = yaml.representer.Representer()
node = representer.represent_data(data)

## convert node into event list
events = ??????

## convert event list into string
string = ??????
--------------------

--
regards,
makoto kuwata

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