From http://www.codewars.com/kata/563f879ecbb8fcab31000041/train

first-class_function_factory.py

def factory(x):
    def multiply(my_array):
        my_array2 = []
        for each in my_array:
            my_array2.append(each*x)
        return my_array2
    return multiply
#using lambda
def factory(x):
    return lambda arr: [x * el for el in arr]

#Another way of passing a function to another function is using a callable object as follows:
class factory:
    def __init__(self, x):
        self.x = x
    def __call__(self, arr1):
        arr2 = []
        for each in arr1:
            arr2.append(each * self.x)
            return arr2
#Using lambda


#My Test Cases

#my_arr = [1, 2, 3]
#threes = factory(3)
#test.assert_equals(threes(my_arr), [3, 6, 9])
#fives = factory(5)
#test.assert_equals(fives(my_arr), [5, 10, 15])