Hi Paul, > But *not* in sympy, in normal Python, if m == 1 and v == 1, then 1/2 * > m * v**2 is 0.5 (a float) currently, as is (m/2) * v**2. But in your > proposal, the former will be a float/fraction hybrid, whereas the > latter will be a float.
No. In my proposal, this will simply be a float. Why? Because my ratiofloats are only generated during compile time. At runtime, they behave like normal floats, so when you calculate (1/2) * x with x being 1, you get 0.5, just float. > And what about > x = 1 > a = 1/3 > b = x/3 > a == Fraction(1,3) > b == Fraction(1,3) > a == b > Currently these are False, False, True. You'll change that to True, > False, True and you've now broken the idea that things that are equal > should compare the same to a 3rd value. Indeed, one could break transitivity here if the implementer of Fraction chose so. But transitivity is not a required thing for == in Python, numpy even returns arrays for it... Cheers Martin _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/GKRDYSPQHJDXLGVXJKKFUKPXIRM3IOVU/ Code of Conduct: http://python.org/psf/codeofconduct/
