Python math.isnan() Function

Mathematics

fractions module

module usage

random module

module usage

random.random()

random.randint()

random.choice()

Choosing random item(s)

random.choices()

random.sample()

random.shuffle()

math module

Introduction

cmath module

math.sin()

math.cos()

math.tan()

math.asin()

math.acos()

math.atan()

math.atan2()

math.sinh()

math.cosh()

math.tanh()

math.asinh()

math.acosh()

math.atanh()

math.exp()

math.pow()

math.sqrt()

math.log()

math.log2()

math.log10()

math.ceil()

math.floor()

math.trunc()

math.modf()

math.fmod()

math.fabs()

math.factorial()

math.gcd()

math.lcm()

math.isqrt()

math.isfinite()

math.isinf()

math.isnan()

math.ldexp()

math.frexp()

math.degrees()

math.radians()

math.copysign()

math.fsum()

math.gamma()

math.hypot()

math.isclose()

math.lgamma()

math.prod()

math.perm()

math.erf()

math.erfc()

math.dist()

math.comb()

math.remainder()

math.pi

math.e

math.inf

math.nan

math.tau

cmath.acosh()

cmath.acos()

cmath.asin()

cmath.asinh()

cmath.atan()

cmath.atanh()

cmath.cos()

cmath.cosh()

cmath.exp()

cmath.isclose()

cmath.isfinite()

cmath.isinf()

cmath.isnan()

cmath.log()

cmath.log10()

cmath.phase()

cmath.polar()

cmath.rect()

cmath.sin()

cmath.sinh()

cmath.sqrt()

cmath.tan()

cmath.tanh()

cmath.e

cmath.inf

cmath.infj

cmath.nan

cmath.nanj

cmath.pi

cmath.tau

The math.isnan() function is used to determine whether or not a given value is Not a Number (NaN).

Syntax:

math.isnan(x)

Where, x is the value which we want to check whether it is Not a Number.

The return value of this function will be either True or False, depending on whether or not the given argument is a NaN.

What do we mean by 'Not a Number'?

Not a Number (NaN) is a special value used to represent any computation result which is undefined or meaningless. It is also known as an undefined number. This value can be returned when the result of a mathematical operation is undefined.For example

Division by zero, such as 1/0.
Calculating the square root of a negative number
Attempting to get logarithm of a negative number.

In Python, NaN is represented as float('nan')

ExampleEdit & Run

import math

print(math.isnan(float('nan')))
print(math.isnan(float('-nan')))
print(math.isnan(math.nan))
print(math.isnan(-math.nan)) Visualize

Output:

TrueTrueTrueTrue[Finished in 0.010698968078941107s]