How to use Pi in Python?

To use Pi in Python, import the 'math' module and access Pi with 'math.pi' for calculations like circumference or area of a circle.

Welcome to a fascinating journey into the world of Pi in Python! Pi, denoted by the Greek letter "π," is a magical and intriguing mathematical constant that has captivated mathematicians and programmers for centuries.

In this comprehensive blog, we will delve deep into Pi's wonders, its significance in mathematics, properties, and practical applications in Python programming. Whether you're a curious learner or a seasoned developer, get ready to unlock all the methods and secrets of Pi and its role in Python programming world.

pi print, pi variable

Understanding the Pi Constant:

First things first, let's grasp the essence of Pi. Pi represents the relationship between a circle's circumference and its diameter. It's an irrational number, which means its decimal representation goes on infinitely without repeating. In Python, working with Pi is made effortless with the help of the math module. 

The math module offers a method to access the constant pi, which stores the precise value of pi. This constant acts as a gateway to exploring the boundless possibilities of pi-based calculations in your Python scripts.

Calculating the Circumference and Area of a Circle


The following code calculates the circumference of a circle with a radius of 10:

import math #import math library
radius = 10
circumference = 2 *math.pi *radius 

This code will print the following output:



The following code calculates the area of a circle with a radius of 10:

import math   #helps in importing pi
radius = 10 
area = math.pi *radius* 2

This code will print the following output:


Exploring Third-Party Modules:

While the built-in `math` library in Python provides essential functionality for working with Pi, the Python ecosystem offers a treasure trove of third-party modules that take Pi-based calculations to the next level. One such powerful module is `mpmath`, meaning "multiprecision math." As the name suggests, `mpmath` allows you to work with Pi and other mathematical constants with astonishing precision, far beyond the limitations of standard floating-point arithmetic.

With `mpmath`, you can calculate Pi to an arbitrary number of decimal places, granting you unparalleled accuracy in your computations. For example, if you need Pi with a precision of 50 decimal places, `mpmath` has got you covered. The following code showcases how to calculate Pi with a specific precision using the `mp.dps` function:

import mpmath as mp  #import pi math
# Set the desired precision to 50 decimal places
mp.dps = 50
# Calculate pi with the specified precision
pi_with_precision = mp.pi

In addition to `mpmath`, the `decimal` module is another valuable ally in working with Pi. It provides high-precision arithmetic for floating-point numbers, allowing for more accurate calculations than standard Python floats. By adjusting the decimal context, you can control the precision of Pi calculations. The code snippet below demonstrates how to calculate Pi with a precision of 30 decimal places using the `decimal` module:

import decimal
# Set the decimal context with a precision of 30
decimal.getcontext().prec = 30
# Calculate pi with the specified precision
pi_with_precision = decimal.Decimal('3.141592653589793238462643383279')

Another method is using numpy module. Here's an example of how you can use the numpy module to work with the value of pi and perform some calculations:

import numpy as np
# Using the pi value from numpy
pi_value = np.pi
# Given radius of the circle
radius = 10
# Calculating the circumference using numpy
circumference = 2  pi_value  radius
# Calculating the area using numpy
area = pi_value  radius * 2
# Printing the results
print("Circumference:", circumference)
print("Area:", area)

In this code, we first import the numpy module using the alias np. The numpy module provides a more powerful and flexible way to work with mathematical operations, including the value of pi.

We use np.pi to directly access the value of pi from numpy. Then, we proceed to calculate the circumference and area using the same formulas as before but with the pi_value obtained from numpy. The advantage of using numpy is that it provides an array of mathematical functions and constants, making complex calculations even more convenient.

Practical Applications of Pi in Python:

The true power of Pi lies in its versatility and applicability across various fields. From scientific simulations to financial modelling, Pi plays a crucial role in a wide range of Python applications.

Scientific Simulations:

Pi's influence extends to scientific simulations that delve into complex phenomena like fluid dynamics, aerodynamics, and even the mysterious realm of quantum mechanics. These simulations help scientists gain insights into natural processes and predict outcomes.


In the realm of robotics, Pi plays a pivotal role. It guides robots through intricate paths by aiding in accurate navigation and precise estimation of their positions. This ability ensures robots can navigate challenging environments effectively.

Computer Vision:

The magic of Pi isn't limited to just numbers; it's also a key player in computer vision. Pi assists in the process of smoothing out noisy data obtained from various sources. Furthermore, it helps computer systems track objects seamlessly within videos, contributing to improved object recognition and surveillance.

Financial Modeling:

Pi's significance extends to the world of finance. When it comes to financial modelling, Pi becomes a tool for prediction. By melding historical data with real-time observations, Pi assists analysts and investors in forecasting market movements. This dynamic use aids in making informed decisions within the ever-fluctuating financial landscape.


We've explored the significance of Pi and various examples, mastered its use in calculating circle properties, and dived into the realm of third-party modules to extend its capabilities. Moreover, we've witnessed the diverse applications of Pi in various fields, highlighting its essential role in scientific simulations, robotics, and more. 

Armed with this newfound knowledge, you're now equipped to unleash the power of Pi in your Python projects, making calculations and simulations more precise and fascinating than ever before. Happy coding!

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