google-trends
Some time ago Google Trends for websites did make possible to get statistics about sites. For example http://trends.google.com/websites?q=wikipedia.org showed the chart about the historical series of unique visitors for wikipedia.org site.
Note that this page explaining Google Trends for website is currently available.
Now that Google Trends for websites has been merged with Google Trends, is it still possible to get the same statistics?
Using too many search terms is counterproductive, so limit your search terms to the minimum number of words necessary to convey the desired meaning of the search term. You should also try to be as specific as possible. Here are the results of the search term python programming on Google Trends.
I think you are perhaps conflating the functionality of Google Trends with the Google Ngram Viewer. It's possible that they were connected together at some point, but the two are definitely separate products now.
Best Answer
Looks like a few weeks ago it was "spring cleaned" as Google likes to put it:
You could use one of the many other stats sites like Alexia, thought the data will be a bit different. And less pretty.