A Lambda function is a small, anonymous, and single-line function used to define small and simple operations where writing a full function using 'def' is unnecessary.
Syntax: lambda arguments: experssion
It can take multiple arguments but only one experssion.
Example
add = lambda a, b: a+b
print(add(3, 5))
def add(a, b):
return a + b
Using with one argument
square = lambda a: a*a
print(square(5))
Using with multiple argument
multiply = lambda a, b, c: a * b * c
print(multiply(2, 4, 6))
Lambda with map() function
It is use to iterate with every item.
sqr_num = [2, 3, 4, 5]
square = list(map(lambda a: a**2, sqr_num))
print(square)
Lambda with filter() function
It is use to filter accroding to condition.
number = [1, 2, 3, 4, 5, 6]
find_odd = list(filter(lambda a: a%2 != 0, number))
print(find_odd)
Lambda with sorted() function
This is a very useful function to sort values.
pair = [("vicky", 1), ("sonal", 2), ("ramesh", 3), ("rani", 4)]
new_sort = list(sorted(pair, key=lambda x: x[0]))
print(new_sort)
Note: x[0] sorts by the first element, while x[1] sorts by the second element. Use reverse=True for descending order. ("vicky", 1): vicky: first element and 1: second element.Practice
Task 1: Sort Even number using Lambda
Task 2: Print Cubes of each number
Task 3: Sorted Number from 1 to 10 from scramble list.
Conclusion
We have complete the Lambda function. It is all about on practic try above code and practice each one and understand the logic behind this.
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