Read this: https://docs.python.org/3.4/tutorial/floatingpoint.html On Sat, Jun 21, 2014 at 9:57 AM, FraserL <fraser.long+usenet at nospamgmail.com> wrote: > I think I found a strange bug in python 3.4.1, >> fresh install of >> https://www.python.org/ftp/python/3.4.1/python-3.4.1.amd64.msi >> and a fresh install of > https://www.python.org/ftp/python/2.7.7/python-2.7.7.amd64.msi > to compare it to. >> #test code > z = 0.01 > p = 0.0 > for x, y in enumerate(range(1, 20)): > p += z > print(p) > #end >>> 3.4.1 output: >> 0.01 > 0.02 > 0.03 > 0.04 > 0.05 > 0.060000000000000005 > 0.07 > 0.08 > 0.09 > 0.09999999999999999 > 0.10999999999999999 > 0.11999999999999998 > 0.12999999999999998 > 0.13999999999999999 > 0.15 > 0.16 > 0.17 > 0.18000000000000002 > 0.19000000000000003 >>> 2.7.7 output: >> 0.01 > 0.02 > 0.03 > 0.04 > 0.05 > 0.06 > 0.07 > 0.08 > 0.09 > 0.1 > 0.11 > 0.12 > 0.13 > 0.14 > 0.15 > 0.16 > 0.17 > 0.18 > 0.19 >>> I'm not hugely accustomed to Python, but this seems crazy to me. > -- > https://mail.python.org/mailman/listinfo/python-list -- INADA Naoki <songofacandy at gmail.com>