Could it be that Python has better libraries, is faster to develop for, attracts
more programmers? If so, I suggest it's worth considering that this might
be *because* Python doesn't have DbC.
I'm not sure how you get from the lack of DbC being a feature to python's success.
I use DbC in my python code via the asserts and its been very useful in my experience.
If there was a nice way to get better then the assert method I'd use it. Like Angus's PoC.
I assume that developers that are not interesting in DbC would simply not use any
library/syntax that supported it.