Re: Can one output something other than 'nan' for not a number values?

Chris Green <cl@isbd.net> writes:

Obviously I can write conditional code to check for float('nan')
values but is there a neater way with any sort of formatting string or

  This solution does not take the various formatting specifiers into
  account correctly, but shows a broad outline of a possible approach.

  main.py

import string
import math

class MyFormatter( string.Formatter ):
    def format_field( self, value, format_spec ):
        if isinstance( value, float )and value != value: value = '-'
        return super().format_field( value, format_spec )

fmt = MyFormatter()
a = math.nan
b = 2.3

print( fmt.format( '{a}, {b}', a=a, b=b))

  sys.stdout

-, 2.3