basic math functions

mathlib.py

def add(a, b):
    """Takes in two numbers and returns their sum"""
    return a + b

def sub(a, b):
    """Takes in two numbers and returns their difference"""
    return a - b

def multiply(a, b):
    """Takes in two numbers and returns their product"""
    return a * b

def divide(a, b):
    """Takes in two numbers and divides the first by the second"""
    return a/b