Understand Python Lambda Expressions. Lambda expressions are also known as anonymous functions. Learn how and when to use them. In Python, a lambda function is an anonymous function (a function without a name) that can take any number of arguments but only contains a single expression.
Lambda expressions are also known as anonymous functions. Learn how and when to use them
In Python, a lambda function is an anonymous function (a function without a name) that can take any number of arguments but only contains a single expression. As an example, here is a lambda that multiplies a number by three:
lambda x : x * 3
This lambda isn’t particularly useful as-is because now there’s no way to call it. However, you can assign it to a variable and then call it just like a regular function:
mult3 = lambda x : x * 3 mult3(15.0) ## returns 45
You don’t need to assign a lambda to a variable. Instead, you can call it right away like this:
(lambda x : x * 3)(15.0) ## returns 45.0
Lambda functions are especially useful when the functionality is needed for only a short period of time and you don’t want to waste resources by creating a separate method to do the job.
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