Returned from function
Lesson 4 of 9 in Coddy's Python Lambda Functions course.
Another interesting use case of lambda function is returning it from a function.
For example,
def power_of(a):
return lambda b : b ** a
cube = power_of(3) # holds lambda b : b ** 3
square = power_of(2) # holds lambda b : b ** 2
square_root = power_of(0.5) # holds lambda b : b ** 0.5
print(cube(4)) # prints 64
print(square(4)) # prints 16
print(square_root(4)) # prints 2As you see it's a way to generate multiple small functions.
It's also possible to create a lambda which returns lambda (when it's one expression),
power_of = lambda a : lambda b : b ** a
print(power_of(2)(5)) # prints 25 = 5 ** 2
Challenge
EasyCreate a function named message_constructor that gets two strings: first name and last name. Last name can be None.
The function will construct a name out of the two arguments, with the following conditions:
- If only the first name exists, then the name will be equal to the first name
- If both of the arguments exist then the function will combine them with a space in between.
The function will return a lambda function that will get one argument, and will return a string.
Take a look at the test cases to understand the needed format from the lambda.
Try it yourself
def message_constructor(first, last):
# Write code here