Incorporated feedback, and pulled in changes from the master trunk.

python.html.markdown

@@ -173,6 +173,9 @@ li.extend(other_li) # Now li is [1, 2, 3, 4, 5, 6]
 # Examine the length with len
 len(li) #=> 6
 
+# Note: lists can contain arbitrary values
+li2 = [1, "Hello", [[], "Hi", 5,]]
+
 # Tuples are like lists but are immutable.
 tup = (1, 2, 3)
 tup[0] #=> 1
@@ -376,6 +379,8 @@ add_10(3) #=> 13
 
 # There are also anonymous functions
 (lambda x: x > 2)(3) #=> True
+rectangle_area = lambda a, b: a * b
+print rectangle_area(3, 4) #=> 12
 
 # There are built-in higher order functions
 map(add_10, [1,2,3]) #=> [11, 12, 13]
@@ -385,6 +390,9 @@ filter(lambda x: x > 5, [3, 4, 5, 6, 7]) #=> [6, 7]
 [add_10(i) for i in [1, 2, 3]]  #=> [11, 12, 13]
 [x for x in [3, 4, 5, 6, 7] if x > 5] #=> [6, 7]
 
+# You can also use dictionary comprehensions
+{i: add_10(i) for i in [1, 2, 3]} #=> {1: 11, 2: 12, 3: 13}
+
 ####################################################
 ## 5. Classes
 ####################################################
@@ -400,7 +408,8 @@ class Human(object):
         # Assign the argument to the instance's name attribute
         self.name = name
 
-    # An instance method. All methods take self as the first argument
+    # An instance method. All methods take self as the first argument,
+    # which refers to the instance of this class
     def say(self, msg):
        return "%s: %s" % (self.name, msg)