Question(s) Concerning Securing Pages From Bots?

On some web pages the user is prompted to type in a series of randomly
generated characters which appear on the screen, in order to limit
access of those pages to real users instead of allowing bots to also
access them. Now my question is is there a plug-in, sample code, or
outright django documentation for doing something like that in a
django/python web application? If so can someone point me to it?
Thanks.

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