python里面的help报HTML documentation files could not be found

[study@localhost study]$ python
Python 2.4.3 (#1, Aug 26 2006, 12:55:14)
[GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> help('print')

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.

>>>

怎么办？