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On Fri, Feb 15, 2019 at 3:56 AM Joe Pfeiffer <pfeiffer at cs.nmsu.edu> wrote: > > ast <none at gmail.com> writes: > > > Le 13/02/2019 ? 14:21, ast a ?crit : > >> Hello > >> > >> >>> float('Nan') == float('Nan') > >> False > >> > >> Why ? > >> > >> Regards > >> > > > > Thank you for answers. > > > > If you wonder how I was trapped with it, here > > is the failing program. > > > > > > r = float('Nan') > > > > while r==float('Nan'): > > inp = input("Enter a number\n") > > try: > > r = float(inp) > > except ValueError: > > r = float('Nan') > > import math > while math.isnan(r) : > > will do what you're looking for. > > If you're using python 3.5 or higher, you can also use math.nan instead > of float('nan'). Or even better, use None instead of nan. There's nothing in Python says you have to (ab)use a floating-point value as a signal. Or use "while True" and add a break if the exception isn't thrown. ChrisA

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