I'd much rather see specific comparisons to other choices, rather than generalizations pointing out the strengths of the language. Why and when, specifically, i

I'd much rather see specific comparisons to other choices, rather than generalizations pointing out the strengths of the language. Why and when, specifically, is Python preferred to C# for web apps? Why and when is it preferred to Ruby? How can we be sure it is not just 'trendy'? Is it common because there is a larger economic force behind it, like C# is only on the list because it is Microsoft's?