The NaNny State
ben+python at benfinney.id.au
Mon Feb 18 17:07:44 EST 2019
"Avi Gross" <avigross at verizon.net> writes:
> It is about the recent discussion about the concept and word "nan" as used
> in python and elsewhere. As noted, the correct spelling in python is all
> lower case as in "nan" with a minor exception that creating a nan using
> float(string) allows any combination of cases such as string="nAN".
Who says that the “correct spelling in python is all lower case "nan"”?
The text representation of a Python ‘float’ NaN object is 'nan'. That is
what the object emits as its text representation; it is not the same
thing as "the correct spelling".
As you note, the ‘float’ type accepts several spellings as input to
create a NaN object, all of them correct spelling.
Similarly, I can spell the number one thousand ‘1000.0’, ‘1.0e+3’
‘1.000e+3’, ‘1000.00000’, and so on. Those are all correct (and, as it
happens, they all result in equal ‘float’ values).
The resulting object will, when I interrogate it, represent itself *by
default* as ‘1000.0’; Python is not showing *the* correct spelling, just
one possible correct spelling.
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