Python 3.6+cmathterm

cmath.nanj

constants

A complex number with a zero real part and NaN as the imaginary part, complex(0.0, nan).

Syntax

cmath.nanj

The real part of nanj is an honest 0.0, but the number as a whole counts as NaN: cmath.isnan(nanj) is True and nanj == nanj is False. A check of z.real alone lets such a value through; look at both parts or call cmath.isnan.

Examples

import cmath
z = cmath.nanj
print(z, z.real)  # → nanj 0.0
print(cmath.isnan(z), z == z)  # → True False

See also

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