Professional hackers or security testers tend to write a lot of code. Over time we develop an enormous arsenal of our own tools, scripts, functions and code snippets that make us significantly more efficient, but are hacks that are only beneficial to us. At Security Innovation the tools we write, are less like tools, I suppose and more like libraries that are meant to make one thing that we do often easier, faster, better, more concise or at least reusable. Write the tools you want to use that way to use them.
Source: https://threatpost.com/developing-and-sharing-tools-professional-hackers-043012/76499/