function.py

# encapsulate reusable code

def addInterest(amount=100, rate=0.1):
    """
    This is a docstring
    New line characters are permitted withion tripple quotes
    """    
    return amount * ( 1+rate )

def makeSquares(n=10):
    '''Take a single parameter and 
    return all the squares of numbers from 1 to that parameter
    '''
    squares = []
    for i in range(1, n+1):
        squares.append(i*i)
    return squares

# use our functions
sq_l = makeSquares() # use the default
print(sq_l)


c = 100
r = 0.1
total = addInterest(c, r)

# we should leave accuracy during calculations and only collapse when outputting
print( 'Adding {1}% to {0} gives a total of {2:0.2f}'.format(c, r, total) )