Add some more exercises to lists and comprehensions

Author: seanchen1991

src/05_lists.py

@@ -26,4 +26,24 @@
 # YOUR CODE HERE
 
 # Print all the values in x multiplied by 1000
+# YOUR CODE HERE
+
+z = [
+    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+    [10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
+    [20, 21, 22, 23, 24, 25, 26, 27, 28, 29],
+    [30, 31, 32, 33, 34, 35, 36, 37, 38, 39],
+    [40 ,41, 42, 43, 44, 45, 46, 47, 48, 49],
+    [50, 51, 52, 53, 54, 55, 56, 57, 58, 59],
+    [60, 61, 62, 63, 64, 65, 66, 67, 68, 69],
+    [70, 71, 72, 73, 74, 75, 76, 77, 78, 79],
+    [80, 81, 82, 83, 84, 85, 86, 87, 88, 89],
+    [90, 91, 92, 93, 94, 95, 96, 97, 98, 99]
+]
+
+# Print the first element from each nested list in the matrix z
+# YOUR CODE HERE
+
+# Print all of the elements that lie on the left-to-right 
+# diagonal of matrix z 
 # YOUR CODE HERE

src/08_comprehensions.py

@@ -17,18 +17,25 @@
 # Write a list comprehension to produce the cubes of the numbers 0-9:
 # [0, 1, 8, 27, 64, 125, 216, 343, 512, 729]
 
-y = []
+cubes = [i**3 for i in range(10)]
+
+print(cubes)
+
+# Write a list comprehension that utilizes slicing syntax to product 
+# a list with the elements from the first half of the `cubes` list
 
-print(y)
+first_half_of_cubes = [i for i in cubes[:5]]
+
+print(first_half_of_cubes)
 
 # Write a list comprehension to produce the uppercase version of all the
 # elements in array a. Hint: "foo".upper() is "FOO".
 
-a = ["foo", "bar", "baz"]
+lowercase = ["foo", "bar", "baz"]
 
-y = []
+uppercase = []
 
-print(y)
+print(uppercase)
 
 # Use a list comprehension to create a list containing only the _even_ elements
 # the user entered into list x.