Disabling implicit tag for timestamp in PyYaml

Greetings,

I get the following result in PyYaml:

 >>> import yaml
 >>> yaml.load('2012-12-24T22:45:51.000000Z')
datetime.datetime(2012, 12, 24, 22, 45, 51)
 >>>

However I do not want this conversion to datetime object, I just want a 
string. Changing the input (i.e. adding quotes) is not desirable.  How 
can I disable this implicit tag?

Thanks,
--dan


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