[Courses] [python] Lesson 2: Loops, if, and beer

[Erin McLaughlin]

> ===================== Homework =======================
>
> 1. Your first programming assignment!
>     Write a program for the old "bottles of beer" song. It should print
>     something like:
>     99 bottles of beer on the wall
>     98 bottles of beer on the wall
>     97 bottles of beer on the wall
>     ... all the way down to 1.
>
>     Extra credit: make it print the number twice, e.g.
>     99 bottles of beer on the wall, 99 bottles of beer
for i in range(99, 0, -1) :
     if i < 3 :
         bottle = "bottle"
     else :
         bottle = "bottles"

     print i, bottle, "of beer on the wall,"
     print i, bottle, "of beer"
     print "Take one down, pass it around,"
     if i == 1 :
         print "No bottles of beer on the wall."
     else :
         print i-1, bottle, "of beer on the wall.\n"
> 2. What does range(0, 10, -1) give?  (Try it.)
>     Any idea why?
It gives an empty set (or, when stuck in code, skips the for loop all 
together), because 10 is greater than zero, but the counter is getting 
-1 added to it (decrementing).  And python magically knows that this is 
not cool.
> 3. How was the length of this lesson? Too much, too little or just right?
I think it was too little, but that's because I am an impatient learner.
> Problem 4 is optional -- it's a little harder, but give it a try,
> and if you don't get it, take a look at the answers other students
> post. But try it on your own first, if you can.
>
> 4. Write a loop using range() that prints out the first five numbers
>     as words:
>     one
>     two
>     three
>     four
>     five
for i in range(1, 6) :
     if i == 1 :
         print "one"
     elif i == 2 :
print "two"
     elif i == 3 :
print "three"
     elif i == 4 :
print "four"
     elif i == 5 :
print "five"
     else :
print "wtf why isn't the loop working?"