"""
Calculator library containing basic math operations.
"""


def add(first_term: int or float,
        second_term: int or float) -> int or float:
    return first_term + second_term


def subtract(first_term: int or float,
             second_term: int or float) -> int or float:
    return first_term - second_term


def multiply(first_term: int or float,
             second_term: int or float) -> int or float:
    return first_term * second_term


def divide(first_term: int or float,
           second_term: int or float) -> int or float:
    return first_term / second_term
