random.expovariate() function in Python Last Updated : 23 Dec, 2021 Suggest changes Share Like Article Like Report random module is used to generate random numbers in Python. Not actually random, rather this is used to generate pseudo-random numbers. That implies that these randomly generated numbers can be determined. random.expovariate() expovariate() is an inbuilt method of the random module. It is used to return a random floating point number with exponential distribution. Syntax : random.expovariate(lambda) Parameters : lambda : a non zero value Returns : a random exponential distribution floating number if the parameter is positive, the results range from 0 to positive infinity if the parameter is negative, the results range from 0 to negative infinity Example 1: Python3 1== # import the random module import random # determining the values of the parameter lambda = 1.5 # using the expovariate() method print(random.expovariate(lambda)) Output : 0.22759592233982198 Example 2: We can generate the number multiple times and plot a graph to observe the exponential distribution. Python3 1== # import the required libraries import random import matplotlib.pyplot as plt # store the random numbers in a # list nums = [] alpha = 3 for i in range(100): temp = random.paretovariate(alpha) nums.append(temp) # plotting a graph plt.plot(nums) plt.show() Output : Example 3: We can create a histogram to observe the density of the exponential distribution. Python3 1== # import the required libraries import random import matplotlib.pyplot as plt # store the random numbers in a list nums = [] lambda = 1.5 for i in range(10000): temp = random.expovariate(lambda) nums.append(temp) # plotting a graph plt.hist(nums, bins = 200) plt.show() Output : Y Yash_R Follow Article Tags : Python Python-random Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 5 min read Python Operators 4 min read Python Keywords 2 min read Python Data Types 7 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 5 min read Python Functions 5 min read Recursion in Python 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 2 min read Python MySQL 9 min read Python Packages 10 min read Python Modules 7 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 4 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 15+ min read StatsModel Library- Tutorial 4 min read Learning Model Building in Scikit-learn 8 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 6 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 7 min read Python | Build a REST API using Flask 3 min read How to Create a basic API using Django Rest Framework ? 4 min read Python PracticePython Quiz 3 min read Python Coding Practice 1 min read Python Interview Questions and Answers 1 min read My Profile ${profileImgHtml} My Profile Edit Profile My Courses Join Community Transactions Logout Like