Python Lambda

Python Lambda

A lambda function is a small anonymous function.

A lambda function can take any number of arguments, but can only have one expression.


Syntax

lambda arguments expression

The expression is executed and the result is returned:

Example

Add 10 to argument a, and return the result:

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Lambda functions can take any number of arguments:

Example

Multiply argument a with argument b and return the result:

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Example

Summarize argument ab, and c and return the result:

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Why Use Lambda Functions?

The power of lambda is better shown when you use them as an anonymous function inside another function.

Say you have a function definition that takes one argument, and that argument will be multiplied with an unknown number:

Use that function definition to make a function that always doubles the number you send in:

Example

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Or, use the same function definition to make a function that always triples the number you send in:

Example

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Or, use the same function definition to make both functions, in the same program:

Example

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Use lambda functions when an anonymous function is required for a short period of time.


Test Yourself With Exercises

Exercise:

Create a lambda function that takes one parameter (a) and returns it.

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