Basic Python 26: Anonymous Function | Lambda Function in Python смотреть онлайн

Python Anonymous/Lambda Function
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What are lambda functions in Python?

an anonymous function is a function that is defined without a name.

While normal functions are defined using the def keyword in Python, anonymous functions are defined using the lambda keyword.

Anonymous functions are also called lambda functions.

syntax:
lambda arguments: expression

Lambda functions can have any number of arguments but only one expression. The expression is evaluated and returned. Lambda functions can be used wherever function objects are required.
ex:
double = lambda x: x * 2

print(double(5))

Use of Lambda Function in python:

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

ex:using 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.

my_list = [1, 5, 4, 6, 8, 11, 3, 12]

new_list = list(filter(lambda x: (x%2 == 0) , my_list))

print(new_list)

Example use with map():
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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.

my_list = [1, 5, 4, 6, 8, 11, 3, 12]

new_list = list(map(lambda x: x * 2 , my_list))

print(new_list)
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