Fixed non-Python-3 bug in post 03.

.gitignore

@@ -2,3 +2,5 @@ _site/
 output.html
 output.txt
 *.sublime-workspace
+.DS_Store
+*.lock

_posts/2014-02-15-03-list-less-than-ten.md

@@ -38,33 +38,33 @@ This week's exercise hits on a topic critical for all types and styles of progra
 The way to construct an empty list is just to do 
 
 {% highlight python %}
-  x = []
+x = []
 {% endhighlight %}
 
 And your variable `x` now holds an empty list. To add things to this list, just "append" them to the list. Like so: 
 
 {% highlight python %}
-  x = []
-  x.append(3)
+x = []
+x.append(3)
 {% endhighlight %}
 
 Your list `x` now looks like `[3]`.
 
 In Python, lists are also **iterables**, which means you can loop through them with a **for loop** in a convenient way. (If you come from other languages like C++ or Java you are most likely used to using a counter to loop through indices of a list - in Python you can actually loop through the elements.) I will let the code speak for itself: 
 
 {% highlight python %}
-  my_list = [1, 3, "Michele", [5, 6, 7]]
-  for element in my_list:
-    print element
+my_list = [1, 3, "Michele", [5, 6, 7]]
+for element in my_list:
+  print(element)
 {% endhighlight %}
 
 Will yield the result: 
 
 {% highlight pycon %}
-  1 
-  3
-  "Michele"
-  [5, 6, 7]
+1 
+3
+"Michele"
+[5, 6, 7]
 {% endhighlight %}
 
 There are many other properties of lists, but for the basic exercise all you should need is this for loop property. Future weeks will address other properties of lists.
@@ -81,17 +81,17 @@ For more information about lists in Python, check out these resources:
 The nice thing about conditionals is that they follow logical operations. They can also be used to test equality. Let's do a small example. Let's say I want to make a piece of code that converts from a numerical grade (1-100) to a letter grade (A, B, C, D, F). The code would look like this: 
 
 {% highlight python %}
-  grade = input("Enter your grade: ")
-  if grade >= 90:
-    print("A")
-  elif grade >= 80:
-    print("B")
-  elif grade >= 70:
-    print("C")
-  elif grade >= 65:
-    print("D")
-  else:
-    print("F")
+grade = input("Enter your grade: ")
+if grade >= 90:
+  print("A")
+elif grade >= 80:
+  print("B")
+elif grade >= 70:
+  print("C")
+elif grade >= 65:
+  print("D")
+else:
+  print("F")
 {% endhighlight %}
 
 What happens if `grade` is 50? All the conditions are false, so `"F"` gets printed on the screen. But what if `grade` is 95? Then all the conditions are true and everything gets printed, right? Nope! What happens is the program goes line by line. The first condition (grade >= 90) is satisfied, so the program enters into the code inside the `if` statement, executing `print("A")`. Once code inside a conditional has been executed, the rest of the conditions are skipped and none of the other conditionals are checked.