On Tue, Mar 19, 2019 at 7:53 AM Wes Turner <wes.tur...@gmail.com> wrote: > > 'True' is a keyword. (Which is now immutable in Python 3.X?) > > >>> True = 1 > File "<stdin>", line 1 > SyntaxError: can't assign to keyword
In Python 3, the source code token "True" is a keyword literal that always represents the bool value True. > In Python 2: > > >>> True > True > >>> True is True > True > >>> True = 1 > >>> True is 1 > True > >>> True is None > False > >>> True = None > >>> True is None > True In Python 2, the source code token "True" is simply a name, and there is a built-in of that name. Before it became a built-in, it was common for scripts to have their own definitions of True and False [1], so to avoid unnecessary breakage, they were made assignable in the normal way. Python 3 simplifies this by making them keywords. But either way, the *values* True and False are special, and are the only two instances of the bool type that will ever exist. ChrisA [1] Note that I learned about this in history class; it was before my time. _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
