Python math.trunc() – Truncate Decimal Part

Python math.trunc()

math.trunc(x) function truncates the decimal value and returns the real or integral value of x.

Syntax

The syntax to call trunc() function is

math.trunc(x)

where

Parameter	Required	Description
x	Yes	A numeric value.

If x is infinity, then trunc(x) raises OverflowError.

If x is nan, then trunc(x) raises ValueError.

Examples

1. Truncate float value

In the following program, we truncate the float value, x = 3.1415 using math.trunc().

Python Program

import math

x = 3.1415
result = math.trunc(x)
print('trunc(x) :', result)

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Output

trunc(x) : 3

2. Truncate negative float value

In the following program, we truncate the negative float value, x = -3.1415, using math.trunc().

Python Program

import math

x = -3.1415
result = math.trunc(x)
print('trunc(x) :', result)

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Output

trunc(x) : -3

3. Truncate infinity

In the following program, we truncate the value of infinity.

Python Program

import math

x = math.inf
result = math.trunc(x)
print('trunc(x) :', result)

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Output

OverflowError: cannot convert float infinity to integer

4. Truncate integer value

In the following program, we truncate an integer value.

Python Program

import math

x = 3
result = math.trunc(x)
print('trunc(x) :', result)

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Output

trunc(x) : 3

5. Truncate NaN

In the following program, we truncate the NaN value.

Python Program

import math

x = math.nan
result = math.trunc(x)
print('trunc(x) :', result)

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Output

ValueError: cannot convert float NaN to integer

Summary

In this Python Math tutorial, we learned the syntax of, and examples for math.trunc() function.