<filename>calc.py
def add(x,y):
    pass

def subtract(x,y):
    pass

def multiply(x,y):
    return x*y

def divide(x,y):
    return x/y

def square(x,y):
    pass

<filename>calc.py
def add(x,y):
    pass

def subtract(x,y):
    pass

def multiply(x,y):
    return x*y

def divide(x,y):
    return x/y

def square(x,y):
    pass
