[Tutor] path to use for setting the environment variable PYTHONDOCS?

[Dick Moores]

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 >>>help('assert')

Sorry, topic and keyword documentation is not available because the Python
HTML documentation files could not be found.  If you have installed them,
please set the environment variable PYTHONDOCS to indicate their location.
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I have Python 2.5. Where are the HTML documentation files?

Thanks,

Dick Moores