pyYAML constructor

Hello all,
I am trying to use the PyYAML capability to construct instances of python 
objects, but when I run the following program, it seems to me that no instance 
of the class Test appears. What I am missing? What is wrong? My system is Ubuntu 
with packages libyaml-0-1 0.1.1-1 and python-yaml 3.05-2. Thanks in advance for 
any help.
----
#!/usr/bin/python

import yaml

class Test(yaml.YAMLObject):
   yaml_tag = u'!Test'

   def __init__(self, name):
       self.name = name

   def __repr__(self):
       return "%s(name=%r)" % (self.__class__.__name__, self.name)


yaml.load("""
--- !Test
name: my name is Test
""")

print globals()
print locals()
----

F. Pollastri

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