[Python-ideas] Hexadecimal floating literals

Victor Stinner victor.stinner at gmail.com
Tue Sep 12 03:23:04 EDT 2017


2017-09-12 3:48 GMT+02:00 Steven D'Aprano <steve at pearwood.info>:
>> k = float("0x1.2492492492492p-3") # 1/7
>
> Why wouldn't you just write 1/7?

1/7 is irrational, so it's not easy to get the "exact value" for a
64-bit IEEE 754 double float.

I chose it because it's easy to write. Maybe math.pi is a better example :-)

>>> math.pi.hex()
'0x1.921fb54442d18p+1'

Victor


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