Python

# Python power function

Using the pow() function is one of the ways to calculate the power of a number in Python. It is a built-in function of python, and it can be used not only to calculate the power of a number but also to calculate the modulus of the power value based on the particular value. Another pow() function exists under the math module, and it can also be used to calculate the power. The uses of pow() and math.pow() functions have shown in this tutorial.

## Use of pow() function:

The syntax of the pow() function has given below.

Syntax:

pow(x, y[, z])

Here, the parameter x contains the base value of the number, and the parameter y contains the power value. The pow() function returns the value of xy. The values of x and y can be positive or negative. The optional parameter, z, is used to calculate the value of xy % z. The return value of this function will be float only if the value of y is negative and the return value is an integer for all other cases.

## Example-1: Use of pow() function with mandatory arguments

Create a python file with the following script to calculate the power using pow() function based on the base and power values taken from the user. The try-except block has been used in the script to handle errors.

try:
# Take the base value from the user

x = int(input("Enter the base value: "))

# Take the power value from the user

n = int(input("Enter the power value: "))

# Print the result

print("%d to the power %d = %0.2f" % (x, n, pow(x, n)))

except:

# Print the error message

print("The value of base or power is not a number")

Output:

The following output will appear after executing the above script with the input values 3 and 5.

The following output will appear after executing the above script with the input values 2 and -3.

The following output will appear after executing the above script with the input values -2 and 4.

The following output will appear after executing the above script with the input values -3 and -3.

## Example-2: Use of pow() function with mandatory and optional arguments

Create a python file with the following script to calculate the power and the modulus value of the power using pow() function based on the base and power values taken from the user. The try-except block has been used here also to handle errors like the previous example.

try:
# Take the base value from the user

x = int(input("Enter the base value: "))

# Take the power value from the user

n = int(input("Enter the power value: "))

# Print the result

print("%d to the power %d = %0.2f" % (x, n, pow(x, n)))

# Print the remainder value

print("The remainder value = ", pow(x, n, 5))

except:

# Print the error message

print("Error exists in the script.")

Output:

The following output will appear after executing the above script with the input values 2 and 3. Here, the 23 is 8, and 8%5 is 3.

## Use of math.pow() function:

The math module will require to import for using the math.pow() function to calculate the power. This function can take two arguments only. The first argument takes the base value, and the second argument takes the power value.

## Example-3: Use of math.pow() function to calculate power

Create a python file with the following script to calculate the power using math.pow() function based on the base and power values taken from the user. The try-except block has been used in the script like the previous examples to handle errors.

# Import math module

import math

try:

# Take the base value from the user

x = int(input("Enter the base value: "))

# Take the power value from the user

n = int(input("Enter the power value: "))

# Print the result using math.pow()

print("%d to the power %d = %0.2f" % (x, n, math.pow(x, n)))

except:

# Print the error message

print("Error exists in the script.")

Output:

The following output will appear after executing the above script with the input values 4 and 5.

## Conclusion:

The uses of python power functions have been explained in this tutorial to know the purpose of using pow() and math.pow() functions in python.