stenof

def tax(bill):
    """Adds 8% tax to a restaurant bill."""
    bill *= 1.08
    print "With tax: %f" % bill
    return bill

def tip(bill):
    """Adds 15% tip to a restaurant bill."""
    bill *= 1.15
    print "With tip: %f" % bill

stenof

"""You might have considered the situation where you would like to reuse a 
piece of code, just with a few different values. Instead of rewriting the 
whole code, it's much cleaner to define a function, 
which can then be used repeatedly."""

""" Function Junction """

"""Functions are defined with three components:
01. 
The header, 

stenof

def square(n):
    """Returns the square of a number."""
    squared = n**2
    print "%d squared is %d." % (n, squared)
    return squared
    
square(10)

stenof

def power(base,exponent):  # Add your parameters here!
    result = base**exponent
    print "%d to the power of %d is %d." % (base, exponent, result)

power(37,4)  # Add your arguments here!

stenof

"""
deserves_another always adds 2 to the output of one_good_turn.
"""

def one_good_turn(n):
    return n + 1
    
def deserves_another(n):
    return one_good_turn(n) + 2

stenof

"""
First, function called cube that takes an argument called number.
Make that function return the cube of that number.
Define a second function called by_three that takes an argument called number.
if that number is divisible by 3, by_three should call cube(number) and return its result. 
Otherwise, by_three should return False.
"""

def cube(number):
    return number**3

stenof

"""
Here is a Python module named math that includes a number of useful variables and functions, 
and sqrt() is one of those functions. In order to access math, all you need is the import keyword. 
"""

#Generic import: Ask Python to print sqrt(25)

import math

print math.sqrt(25)

stenof

import math            # Imports the math module
everything = dir(math) # Sets everything to a list of things from math
print everything       # Prints 'em all!

stenof

## Don't forget the colon at the end of the function definition!


def shut_down(s):
    
    if s=="yes":
        return("Shutting down")
        
    elif s=="no":
        return("Shutdown aborted")

stenof

# What if we went to Los Angeles for 5 days and brought an extra 600 dollars of spending money?

def hotel_cost(nights):
    
    return 140 * nights
    
    
def plane_ride_cost(city):
    if city == "Charlotte":
        return (183)