Use of Lambda Function in python

We use lambda functions when we require a nameless function for a short period of time.

In Python, we generally use it as an argument to a higher-order function (a function that takes in other functions as arguments). Lambda functions are used along with built-in functions like filter(), map() etc.

Example use with filter()

The filter() function in Python takes in a function and a list as arguments.

The function is called with all the items in the list and a new list is returned which contains items for which the function evaluates to True.

Here is an example use of filter() function to filter out only even numbers from a list.

Example use with map()

The map() function in Python takes in a function and a list.

The function is called with all the items in the list and a new list is returned which contains items returned by that function for each item.

Here is an example use of map() function to double all the items in a list.

	# Program to filter out only the even items from a list
	my_list = [1, 5, 4, 6, 8, 11, 3, 12]
	new_list = list(filter(lambda x: (x%2 == 0) , my_list))
	print(new_list)
	Output
	[4, 6, 8, 12]

view raw Use-Lambda-Function-filter-python.py hosted with by GitHub

	# Program to double each item in a list using map()
	my_list = [1, 5, 4, 6, 8, 11, 3, 12]
	new_list = list(map(lambda x: x * 2 , my_list))
	print(new_list)
	Output
	[2, 10, 8, 12, 16, 22, 6, 24]

view raw Use-Lambda-Function-map-python.py hosted with by GitHub

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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