Earlier quoted context omitted.
Depends what you call robust. If you mean "strongly typed", PHP and Javascript come to mind immediately.
By robust, I mean the language/compiler has a strong test suite and the runtime is known to work reliably in production settings. I've heard horror stories about Sun's HotSpot JIT crashing frequently, but that was what, 10 or 20 years ago? Now that I think about it, Scala might be a modern example of that, but I haven't kept up with how they might have improved.
Re: Why We Choose Python
#61PHP has a test suite, but it's released with over hundred tests failing. See here: http://gcov.php.net/viewer.php?version=PHP_5_5