What I meant: production ready depends on the feature. So for substituting Python (and beeing able to write fast in-language extensions), the language is most likely production ready; so in a sense it is a replacement for Python + C; but not a replacement for C. And this is a bit sad, because it could have been (building linked executables should be possible, since the language is compiled).

But I like your question, lets call it 'which languages are all purpose production ready'; probably only C, C++, Java (there is a real-time version), LabView.