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The Python cmath.inf constant defines positive infinity. This constant is a predefined value, that represents a number greater than any finite number.

We can use float('inf') as an integer to represent it as a positive infinity. When we set a variable, it is always greater or smaller than the other numbers.

This constant can only be used with floating-point numbers in Python. We can also use infinity values in Python arrays and other data structures like lists, sets, and dictionaries.

Syntax

Following is the basic syntax of the Python cmath.inf Constant −

cmath.inf

Return Value

This constant returns the value of a floating-point infinity.

Example 1

In the below example, we are representing positive and negative infinity using cmath.inf function.

import cmath
pos_infinity = float('inf')
print(pos_infinity)
neg_infinity = float('-inf')
print(neg_infinity) 

Output

The result is obtained is as follows −

inf
-inf

Example 2

Now, we are using cmath.inf constant to find the minimum values in a list of numbers. We are using the "minimum_value" variables with positive infinity, and then these values iterate through the list.

import cmath
x = [10, 15, 20, 25, 30, 35]
minimum_value = cmath.inf
for x in x:
   if x < minimum_value:
      minimum_value = x
print("The minimum value in the list is:", minimum_value)

Output

Following is the output of the above code −

The minimum value in the list is: 10

Example 3

Here, we are calculating arithmetic operations using cmath.inf.

import cmath
positive_infinity = -200
print(positive_infinity + 2000)  
negative_infinity = 100
print(negative_infinity - 1000)
print(positive_infinity * 1000)
print(1 / negative_infinity)

Output

The output obtained is as follows −

1800
-900
-200000
0.01

Example 4

In the following example, dividing a finite number by infinite results in zero.

import cmath
x = 102
result = x/cmath.inf
print(result)

Output

We will get the output as follows −

0.0

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