Python Lambda

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Lambda Overview

”’Python Lambda

A lambda function is a small anonymous function.

A lambda function can take any number of arguments, but can only have one expression.

Syntax

lambda arguments : expression

”’

The expression is executed and the result is returned:

Example1:=>

A lambda function that adds 10 to the number passed in as an argument, and print the result:

				
					x = lambda a : a + 10
print(x(5))

Lambda functions can take any number of arguments:

Example2:=>

A lambda function that multiplies argument a with argument b and print the result:

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

A lambda function that sums argument a, b, and c and print the result:

				
					x = lambda a, b, c : a + b + c
print(x(5, 6, 2))

The power of lambda is better shown when you use them as an anonymous function inside another function.

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

Use that function definition to make a function that always doubles the number you send in:

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

mydoubler = myfunc(2)  # lambda a : a * 2
print(mydoubler(11))