Python Lambda Syntax | lambda arguments | def myfunc(n)

Python Lambda

A lambda operate could be a tiny anonymous operation. A lambda operate will take any variety of arguments, however will solely have one expression.

Syntax:

lambda arguments: expression

The expression is dead and also the result’s returned:

Example:

A lambda operates that adds 15 to the quantity passed in as Associate in Treating argument, and print the result:

y = lambda a: a + 15
print(y(5)

Output:

C:\Users\Pramod\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/Pramod/PycharmProjects/pythonProject/main.py
20

Process finished with exit code 0

Lambda functions will take any variety of arguments:

Example

A lambda operates that multiplies argument x with argument y and print the result:

a = lambda x, y : x * y
print(a(5, 6))

Output:

C:\Users\Pramod\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/Pramod/PycharmProjects/pythonProject/main.py
30

Process finished with exit code 0

Example:

A lambda operates that sums argument x, y, and z and prints the result:

a = lambda x, y, z : x + y + z
print(a(5, 6, 2))

Output:

C:\Users\Pramod\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/Pramod/PycharmProjects/pythonProject/main.py
13

Process finished with exit code 0

Why Use Lambda Functions?

The power of lambda is best shown once you use them as an Associate function inside another function.

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

def myfunc(n):
    return lambda a : a * n

Use that operate definition to create a operate that forever doubles the quantity you send in:

Example1

def myfunc(n):
    return lambda a : a * n
mydoubler = myfunc(2)

print(mydoubler(11))

Output:

C:\Users\Pramod\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/Pramod/PycharmProjects/pythonProject/main.py
22

Process finished with exit code 0

Or, use an identical operate definition to create an operation that forever triples the quantity you send in.

Example:2

def myfunc(n):
    return lambda a : a * n
mytripler = myfunc(3)
print(mytripler(11))

Output:

C:\Users\Pramod\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/Pramod/PycharmProjects/pythonProject/main.py
33

Process finished with exit code 0

Or, use identical operates definition to create each function, within the same program:

Example3

def myfunc(n):
    return lambda a : a * n

mydoubler = myfunc(2)
mytripler = myfunc(3)

print(mydoubler(11))
print(mytripler(11))

Output:

C:\Users\Pramod\PycharmProjects\pythonProject\venv\Scripts\python.exe C:/Users/Pramod/PycharmProjects/pythonProject/main.py
22
33

Process finished with exit code 0