I know really little about Python except that it was heavily adopted by Google.
However for C++, I think that corporatization is having a strong negative influence on the language, which leads to it being stuffed with poorly integrated features which nobody really overlooks any more.
You just need to follow the mailing lists [1] and see that many core developers themselves are caught by some namespace abnormality.
It is a pity that Greenspun's 10th rule is in full effect again and we're stuck with an inferior Lisp/ML, especially in the scientific sector.
[1] Or rather the archives, since they are now de facto corporate owned. There is no free discussion any more and people are afraid to post.