I don’t disagree with you. Python seems to encourage poor development practices. Basically, anything goes. This can be problematic if you use other people’s li

I don’t disagree with you. Python seems to encourage poor development practices. Basically, anything goes. This can be problematic if you use other people’s libraries, and if their libraries are not fully vetted. This is not a Python problem, per se. It is a developer problem. It is a human problem. However, with your own code and libraries, you can enforce your own rigor. Keep your functions smaller, test all the inputs, and validate all the outputs. Although you may end up with smaller production code, but more unit tests. The unit tests are good, as they give you evidence that you did cover those corner cases. However, the good thing, is that if the functions are smaller, and well unit tested, then it becomes rare that you have to modify it at a later date. And especially if you think through all the different angles, and try to future proof it. Now you have the ability to do functional composition. Just keep chaining the outputs of one function into another.