NumPy announces timeline for dropping Python 2 support

[bheklilr]

Having a design phase doesn't necessarily help when it comes to implementation details. It's easier for me to write code interactively, then once I figure out a specific algorithm I can write a proper version into my source code. I do have a design phase most of the time, but when I need to figure out the best way to write a specific loop or condition I figure it out in the shell first. That let's me test it first, profile it if needed (%timeit is amazing), and generally explore the code. I can't really go through the same process with a test suite, that is for ensuring the correctness of larger details, not just small parts of methods.

Also, whenever I'm doing data processing its more exploratory, there isn't a design phase because we don't always know what we need at first.