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Python Nested Lambda Function
Last Updated : April 24, 2025
In Python programming language, an anonymous function i.e., a function without a name and lambda keyword is known as the Lambda function. A normal function is defined by the def keyword and with a function name, while a lambda function is defined by the lambda keyword and without a function name.
Python Nested Lambda Function
When a lambda function is used inside another lambda function then it is called Nested Lambda Function.
Execution Behaviour
The execution behavior of the nested lambda function is - the inner lambda function creates a function when the outer lambda function is called. The outer lambda function returns this function. This function is then called with the given argument.
Syntax
Below is the syntax to declare a nested lambda function:
lambda parameterlist : lambda parameterlist : expression
Consider the below examples,
Nested Lambda Function Example 1
# Python program to demonstrate the use of
# nested lambda functions
func = lambda x = 1, y = 2:lambda z: x +y+z
objF = func()
print(objF(1))
print(objF(2))
print(objF(3))
print(objF(4))
The output of the above code will be:
4
5
6
7
Explanation
In the above code, we created an object objF of func, and called it 4 times with different values 1, 2, 3, and 4. When objF is called with the provided value – the nested lambda function will take the value of x and y from the first lambda function (the values are 1 and 2) and the value of z will be called the object's parameter that is 1 in first the case (print(objF(1))).
Nested Lambda Function Example 2
# Python program to demonstrate the use of
# nested lambda functions
# Calculate cube
cube = lambda a: a**3
# Calculate product with cube
product = lambda f, n: lambda a: f(a)*n
result = product(cube, 10)(5)
print(result)
result = product(cube, 10)(2)
print(result)
The output of the above code will be:
1250
80
Explanation
For case 1 (product(cube, 10)(5)): When the product function is called cube function gets bound to f and 10 gets bound to n which then returns a function which is bound to the product which when called with 5, a is assigned this and cube is called, which returns 125 and then it is multiplied with n which is 10. Thus, the final result will be 1250.
Python Nested Lambda Function Exercise
Select the correct option to complete each statement about nested lambda functions in Python.
- In Python, a nested lambda is a lambda function defined ___ another lambda function.
- Nested lambda functions are commonly used to create ___ functions.
- In nested lambdas, the outer lambda typically ___ the inner lambda.
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