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On 2024-02-17, Cameron Simpson via Python-list <python-list@python.org> wrote:
On 16Feb2024 22:12, Chris Green <c...@isbd.net> wrote:
I'm looking for a simple way to make NaN values output as something
like '-' or even just a space instead of the string 'nan'.  [...]

   Battery Voltages and Currents
   Leisure Battery - 12.42 volts  -0.52 Amps
   Starter Battery - 12.34 volts  -0.01 Amps

The simplest thing is probably just a function writing it how you
want it:

     def float_s(f):
         if isnan(f):
             return "-"
         return str(f)

Since he's obviously using one of the float formatting mechanisms to
control the number of columsn and decimal places, I doubt str(f) will
meet the need.

I tried monkey-patching the float type's __format__ method, but it's

Is float.__format__() what's used by f-strings, the '%' operator, etc.?


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