The example on this page:
http://docs.python.org/2/library/profile.html?highlight=pstats#profile.Profile

Shows:

import cProfile, pstats, io
pr = cProfile.Profile()
pr.enable()
... do something ...
pr.disable()
s = io.StringIO()
ps = pstats.Stats(pr, stream=s)
ps.print_results()

Where "ps.print_results()" should be "ps.print_stats()"

Added py3 patch

py2

Thanks for the patches, however the Python 2 example doesn't work.
I think a BytesIO should be used instead of a StringIO, and print_stats() only returns a pstats.Stats instance, without actually printing any result.
I wonder if print_results was an old method that has been removed and if now there's another way to print the results.
I haven't tried on Python 3 yet, but the same comment might apply there too.

A slightly more complete example that I tested:

http://stackoverflow.com/a/16077568/1556290

Here is a fixed version for python2.7. Using StringIO instead of io module fixes the problem pointed by Ezio.
The print_stats method dumps the stats either on sys.stdout if `Stats` class is declared without a stream specification or in the given stream parameter (the name print_stats may be a bit misleading).

New changeset 93018d47793f by Senthil Kumaran in branch '2.7':
Correct Profile class usage example. Addresses issue #18033 .
http://hg.python.org/cpython/rev/93018d47793f

New changeset ab4d3ccb92e6 by Senthil Kumaran in branch '3.3':
Correct Profile class usage example. Addresses issue #18033.
http://hg.python.org/cpython/rev/ab4d3ccb92e6

New changeset 88182b388bae by Senthil Kumaran in branch 'default':
merge from 3.3
http://hg.python.org/cpython/rev/88182b388bae

I consolidated the patches and example and have committed them to 2.7, 3.3 and 3.4. Thanks for your contributions.