If people&#x27;s hopes of coding bug-free code in Python 2 actually panned out<p>then they would have bug free code<p>thus when they port their code to python 3, the unicode changes would not reveal latent (existing) bugs<p>thus they would not blog about or tell people about said bugs, hence the author of that sentence would not have heard about such bugs<p>moral of the story: Python 2 <i>hides</i> certain kind of unicode related bugs that are not exposed until you port to Python 3.