Python’s built-in

function returns the absolute value of the argument **abs(x)**`x`

that can be an integer, float, or object implementing the `__abs__()`

function. For a complex number, the function returns its magnitude. The absolute value of any numerical input argument `-x`

or `+x`

is the corresponding positive value `+x`

.

Argument | `x` | int, float, complex, object with `__abs__()` implementation |

Return Value | `|x|` | Returns the absolute value of the input argument.Integer input –> Integer output Float input –> Float output Complex input –> Complex output |

## Interactive Code Shell

## Example Integer abs()

The following code snippet shows you how to use the absolute value 42 of a positive integer value 42.

# POSITIVE INTEGER x = 42 abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}") # Absolute value of 42 is 42

The following code snippet shows you how to use the absolute value 42 of a negative integer value -42.

# NEGATIVE INTEGER x = -42 abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}") # Absolute value of -42 is 42

## Example Float abs()

The following code snippet shows you how to use the absolute value 42.42 of a positive integer value 42.42.

# POSITIVE FLOAT x = 42.42 abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}") # Absolute value of 42.42 is 42.42

The following code snippet shows you how to use the absolute value 42.42 of a negative integer value -42.42.

# NEGATIVE FLOAT x = -42.42 abs_x = abs(x) print(f"Absolute value of {x} is {abs_x}") # Absolute value of -42.42 is 42.42

## Example Complex abs()

The following code snippet shows you how to use the absolute value of a complex number (3+10j).

# COMPLEX NUMBER complex_number = (3+10j) abs_complex_number = abs(complex_number) print(f"Absolute value of {complex_number} is {abs_complex_number}") # Absolute value of (3+10j) is 10.44030650891055

## Python abs() vs fabs()

Python’s built-in function `abs(x)`

calculates the absolute number of the argument `x`

. Similarly, the `fabs(x)`

function of the math module calculates the same absolute value. The difference is that `math.fabs(x)`

always returns a float number while Python’s built-in `abs(x)`

returns an integer if the argument `x`

is an integer as well. The name * “fabs”* is shorthand for

*.*

**“float absolute value”**Here’s a minimal example:

x = 42 # abs() print(abs(x)) # 42 # math.fabs() import math print(math.fabs(x)) # 42.0

## Python abs() vs np.abs()

Python’s built-in function `abs(x)`

calculates the absolute number of the argument `x`

. Similarly, NumPy’s `np.abs(x)`

function calculates the same absolute value. There are two differences: (1) `np.abs(x)`

always returns a float number while Python’s built-in `abs(x)`

returns an integer if the argument `x`

is an integer, and (2) `np.abs(arr)`

can be also applied to a NumPy array `arr`

that calculates the absolute values element-wise.

Here’s a minimal example:

x = 42 # abs() print(abs(x)) # 42 # numpy.abs() import numpy as np print(np.fabs(x)) # 42.0 # numpy.abs() array a = np.array([-1, 2, -4]) print(np.abs(a)) # [1 2 4]

**abs** and **np**. absolute are completely identical. It doesn’t matter which one you use. There are several advantages to the short names: They are shorter and they are known to **Python** programmers because the names are identical to the built-in **Python** functions.

## Summary

The `abs()`

function is a built-in function that returns the absolute value of a number. The function accepts integers, floats, and complex numbers as input.

If you pass `abs()`

an integer or float, `n`

, it returns the non-negative value of `n`

and preserves its type. In other words, if you pass an integer, `abs()`

returns an integer, and if you pass a float, it returns a float.

# Int returns int >>> abs(20) 20 # Float returns float >>> abs(20.0) 20.0 >>> abs(-20.0) 20.0

The first example returns an int, the second returns a float, and the final example returns a float and demonstrates that `abs()`

always returns a positive number.

Complex numbers are made up of two parts and can be written as `a + bj`

where `a`

and `b`

are either ints or floats. The absolute value of `a + bj`

is defined mathematically as `math.sqrt(a**2 + b**2)`

. Thus, the result is always positive and always a float (since taking the square root always returns a float).

>>> abs(3 + 4j) 5.0 >>> math.sqrt(3**2 + 4**2) 5.0

Here you can see that `abs()`

always returns a float and that the result of `abs(a + bj)`

is the same as `math.sqrt(a**2 + b**2)`

.

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