Currying (Functional Programming Technique)

Definition:

Currying is a technique where a function with multiple arguments is transformed into a sequence of functions, each taking a single argument.

Example:

def multiply(x):
    def inner(y):
        return x * y
    return inner

# Usage:
mul_by_3 = multiply(3)
result = mul_by_3(5)   # result is 15

# Or, in one line:
result = multiply(3)(5)  # result is 15

Explanation:

multiply(3)

returns a function that multiplies its argument by 3.