Python, to its credit, has been making changes of that level. First, True and False were just the integers 1 and 0. Then they were given special values that nu

Python, to its credit, has been making changes of that level. First, True and False were just the integers 1 and 0. Then they were given special values that numerically evaluated to 1 and 0, but __str__ now emitted 'True' or 'False'. They were still global variables, though, so they could be reassigned ('True, False = False, True') and cost a dictionary lookup to use. Finally, with Python 3, they (along with None) were made keywords so that such shenanigans could be stopped.