How to Use Pi in Python

1. Use the math.pi() Function to Get the Pi Value in Python
2. Use the numpy.pi() Function to Get the Pi Value in Python
3. Use the scipy.pi() Function to Get the Pi Value in Python
4. Use the math.radians() Function to Get the Pi Value in Python

Python has a lot of objects and modules available for mathematical and scientific calculation.

In this tutorial, we will find and use the pi value in Python.

Use the math.pi() Function to Get the Pi Value in Python

For this, we will use the math module. The math module provides access to the mathematical functions in the Python programming language.

There are a lot of functions associated with this module. The math.pi() function is used for accessing the value of pi in Python. First of all, import the math module to access the pi function.

For example,

import math

math.pi

Output:

3.141592653589793

We can now use this value for our calculations and expressions.

Use the numpy.pi() Function to Get the Pi Value in Python

The numpy.pi() can also return the value of pi in Python.

For example,

import numpy

print(numpy.pi)

Output:

3.141592653589793

Use the scipy.pi() Function to Get the Pi Value in Python

The pi() function from the scipy module can also return the value of pi.

import scipy

print(scipy.pi)

Output:

3.141592653589793

All three modules return the same value. The only reason why this function exists in three modules is that it allows us to work with pi value without importing any other module. For example, while working with NumPy, we won’t have to import math or scipy to get the value of pi.

Use the math.radians() Function to Get the Pi Value in Python

This is an unconventional method and is hardly ever used. There is another way to convert degrees to radians in Python without dealing with pi directly for the particular case. There is a function named radians() converting degree to radians in the math module.

import math

math.radians(90)

Output:

1.5707963267948966

We can use this function to get the value of pi, as shown below.

import math

math.radians(180)

Output:

3.141592653589793

As you can see, when we convert 180 degrees to radians, we get the value for pi.