Check if floating point number is normal in Python

Question

Are there any python library functions that discriminate between regular floating point numbers, and all of the atypical ones, NaN, +/-Inf, denormal etc.?

Essentially, I'm asking the Python version of this question: check if floating point variable has 'normal' values

Answer 1

To check if a float x is finite, just use math.isfinite(x).

To check if a float x is denormal (subnormal), here is a possible snippet:

import numpy
x = 1.0e-320
fmin_normalized = numpy.finfo(type(x)).tiny
x_is_subnormal =  numpy.isfinite(x) and x!= 0 and abs(x) < fmin_normalized
print(x_is_subnormal)

I let you finish the work (write the appropriate lambda and filter the collection)