Python pow() usage and examples

Python built-in functions

The pow() function returns the power of the specified number.

The syntax of pow() is:

pow(x, y, z)

pow() parameters

The pow() function has three parameters:

• x -a number, the base

• y -a number, the exponent

• z (optional) -a number used for modulus

Therefore,

• pow(x, y) equals x^y

• pow(x, y, z) equals x^y mod z

Example1: Python pow()

# Positive x, positive y (x　**　y)
print(pow(2,　2))    #　4
# Negative x, positive y
print(pow(-2,　2))    #　4　　
# Positive x, negative y
print(pow(2,　-2))    #25
# Negative x, negative y
print(pow(-2,　-2))    #25

output result

4
4
0.25
0.25

Example2: has three parameters (x ** y) % z^y

x =　7
y =　2
z =　5
print(pow(x, y, z))    #　4

output result

4

Here,7of2to the power of equals49.49modulus of5equals4.

Python built-in functions