**cmath.isinf() Method in Python:**

The cmath.isinf() method determines whether or not a value is positive or negative infinity.

This method gives the following Boolean value: If the value is infinity, True; otherwise, False.

**Syntax:**

cmath.isinf(x)

**Parameters**

**x:** This is Required. The value used to test for infinity

**Return Value:**

Returns a bool value that is True if the value is infinite and False otherwise.

**Examples:**

**Example1:**

**Input:**

Given Complex Number = 3+4j

**Output:**

The result after applying isinf() method to the given complex number (3+4j) = False

**Example2:**

**Input:**

Given realpart = 5 Given imaginary part = 2

**Output:**

Enter real part and complex part of the complex number = 5 2 The result after applying isinf() method to the given complex number (5+2j) = False

**Note:** The above input format is for dynamic input.

## cmath.isinf() Method with Examples in Python

### Method #1: Using Built-in Functions (Static Input)

**Approach:**

- Import cmath module(for complex number operations) using the import keyword.
- Give the complex number as static input and store it in a variable.
- Pass the given complex number as an argument to the cmath.isinf() method that determines whether a given complex number’s value is positive or negative infinity.
- Store it in another variable.
- Print the above result after applying isinf() method to the given complex number.
- The Exit of the Program.

**Below is the implementation:**

# Import cmath module(for complex number operations) using the import keyword. import cmath # Give the complex number as static input and store it in a variable. complexnumb = 3 + 4j # Pass the given complex number as an argument to the cmath.isinf() method # that determines whether a given complex number's value is positive or # negative infinity. # Store it in another variable. rslt = cmath.isinf(complexnumb) # Print the above result after applying isinf() method to the given complex number. print("The result after applying isinf() method to the given complex number", complexnumb, " = ") print(rslt)

**Output:**

The result after applying isinf() method to the given complex number (3+4j) = False

Similarly, try for the other examples

import cmath complexnumb = complex(10 + float('inf')) rslt = cmath.isinf(complexnumb) print("The result after applying isinf() method to the given complex number", complexnumb, " = ") print(rslt)

**Output:**

The result after applying isinf() method to the given complex number (inf+0j) = True

### Method #2: Using Built-in Functions (User Input)

**Approach:**

- Import cmath module(for complex number operations) using the import keyword.
- Give the real part and imaginary part of the complex number as user input using map(), int(), split().
- Store it in two variables.
- Using a complex() function convert those two variables into a complex number and store them in a variable.
- Pass the given complex number as an argument to the cmath.isinf() method that determines whether a given complex number’s value is positive or negative infinity.
- Store it in another variable.
- Print the above result after applying isinf() method to the given complex number.
- The Exit of the Program.

**Below is the implementation:**

# Import cmath module(for complex number operations) using the import keyword. import cmath # Give the real part and imaginary part of the complex number as user input # using map(), int(), split(). # Store it in two variables. realnumb, imaginarynumb = map(int, input( 'Enter real part and complex part of the complex number = ').split()) # Using a complex() function convert those two variables into a complex number. complexnumb = complex(realnumb, imaginarynumb) # Pass the given complex number as an argument to the cmath.isinf() method # that determines whether a given complex number's value is positive or # negative infinity. # Store it in another variable. rslt = cmath.isinf(complexnumb) # Print the above result after applying isinf() method to the given complex number. print("The result after applying isinf() method to the given complex number", complexnumb, " = ") print(rslt)

**Output:**

Enter real part and complex part of the complex number = 5 2 The result after applying isinf() method to the given complex number (5+2j) = False