Python Why Lambda Function

Why Use Lambda Functions?

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:

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

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

Example

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

mydoubler = myfunc(2)

print(mydoubler(11))
Try it Yourself »

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

Example

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

mytripler = myfunc(3)

print(mytripler(11))
Try it Yourself »

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

Example

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

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

print(mydoubler(11))
print(mytripler(11))
Try it Yourself »

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

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