Check if a Number is a Whole Number in Python
Floating-point numbers in Python can sometimes pose challenges when you need to determine whether they represent whole numbers. Due to the inherent precision limitations of floating-point representation, comparing them directly for equality with integers may lead to unexpected results. In this article, we will explore some different methods to check if a float value is a whole number in Python.
Check If A Float Value Is A Whole Number
Below, we will explain some methods of How To Check If A Float Value Is A Whole Number in Python.
- Using the
is_integer() - Comparing with
int() - Using the
%Operator - Using
math.isclose()
Check If A Float Value Is A Whole Number Using the is_integer()
In this example, below Python code below defines a function `is_whole_number_method1` that takes a number as input and returns `True` if the number is a whole number (integer), using the `is_integer()` method.
def is_whole_number_method1(number):
return number.is_integer()
# Example
float_value = 7.0
result = is_whole_number_method1(float_value)
print(f"{float_value} is a whole number: {result}")
Output
7.0 is a whole number: True
Check If A Float Value Is A Whole Number Comparing with int()
In this example, below Python code defines a function `is_whole_number_method2` that checks if a number is a whole number by comparing it to its integer conversion. The example uses this method to verify if the float value 9.5 is a whole number and prints the result.
def is_whole_number_method2(number):
return number == int(number)
# Example
float_value = 9.5
result = is_whole_number_method2(float_value)
print(f"{float_value} is a whole number: {result}")
Output
9.5 is a whole number: False
Check If A Float Value Is A Whole Number Using the % Operator
In this example, below Python code defines a function `is_whole_number_method3` that determines if a number is a whole number by checking if the remainder of its division by 1 is equal to 0. The example uses this method to evaluate if the float value 3.14 is a whole number and prints the result.
def is_whole_number_method3(number):
return number % 1 == 0
# Example
float_value = 3.14
result = is_whole_number_method3(float_value)
print(f"{float_value} is a whole number: {result}")
Output
3.14 is a whole number: False
Check If A Float Value Is A Whole Number Using math.isclose()
In this example, below Python code introduces a function `is_whole_number_method4` that utilizes the `math.isclose` function to check if a number is approximately equal to its rounded version, thereby determining if it is a whole number. The example applies this method to assess if the float value 10.0001 is a whole number and prints the result.
import math
def is_whole_number_method4(number):
return math.isclose(number, round(number))
# Example
float_value = 10.000
result = is_whole_number_method4(float_value)
print(f"{float_value} is a whole number: {result}")
Output
10.0 is a whole number: True
Conclusion
In conclusion, the provided Python code offers four different methods to check if a float value is a whole number. Each method leverages distinct approaches, such as utilizing built-in methods like is_integer(), direct comparison with the integer conversion, checking the remainder of division by 1, and employing the math.isclose function for approximate equality with the rounded version.
