LAMBDA

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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

Example :

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))

====o/p====
15

Lambda functions can take any number of arguments.

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

====o/p====
36

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

x = lambda a, b, c : a + b + c
print(x(2, 6, 9))

====o/p=====
17

Why We Use Lambda Functions?

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

Assume 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 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)

print(mydoubler(11))

=====o/p====
22

Or, use the same function definition to make a function that always 'triples' the number you send in:

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

mytripler = myfunc(3)

print(mytripler(22))

====o/p====
66

Or, use the same function definition to make both functions, in the same program :

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

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

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

=====o/p=====
22
33

Use lambda functions when an anonymous function is required for a short period of time.