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From: Peter Otten <__peter__@web.de>
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Date: Fri, 19 Oct 2012 10:59:59 +0200
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Xref: csiph.com comp.lang.python:31720

Mark Lawrence wrote:

> Where is this specific usage documented as my search engine skills have
> let me down?  

find and grep ftw.

> By this I mean entering help() without parameters to get
> the following output and then the help> prompt.

http://docs.python.org/dev/py3k/library/functions.html#help

"""
help([object])
Invoke the built-in help system. (This function is intended for interactive 
use.) If no argument is given, the interactive help system starts on the 
interpreter console. If the argument is a string, then the string is looked 
up as the name of a module, function, class, method, keyword, or 
documentation topic, and a help page is printed on the console. If the 
argument is any other kind of object, a help page on the object is 
generated.
"""