Higher Class Functions - Function Constructors

Those function that create other functions, such as:

def create_specific_sum(x)
	def sum (y):
		return x + y
		
	return sum
 
sum_3_to = create_specific_sum(3)
assert sum_3_to(4) == 7

In python and other languages, it can be generalized from a First Order Functions using the partial function:

from functools import partial
 
def sum(x, y):
	return x + y
 
sum_3_to = partial(sum, x = 2)
 
assert sum_3_to(1) == 4