Learn

Let’s return to our classroom heights example:

heights = [["Noelle", 61], ["Ali", 70], ["Sam", 67]]

Two-dimensional lists can be accessed similar to their one-dimensional counterpart. Instead of providing a single pair of brackets [ ] we will use an additional set for each dimension past the first.

If we wanted to access "Noelle"‘s height: 

#Access the sublist at index 0, and then access the 1st index of that sublist. 
noelles_height = heights[0][1] 
print(noelles_height)

Would output: 

61

Here are the index numbers to access data for the list heights:

Element Index
"Noelle" heights[0][0]
61 heights[0][1]
"Ali" heights[1][0]
70 heights[1][1]
"Sam" heights[2][0]
67 heights[2][1]

Let’s practice accessing data in a two-dimensional list.

Instructions

1.

We want to have a way to store all of our classroom test score data.

Using the provided table, create a two-dimensional list called class_name_test to represent the data. Each sublist in class_name_test should have one student’s name and their associated score.

Name Test Score
"Jenny" 90
"Alexus" 85.5
"Sam" 83
"Ellie" 101.5

Print class_name_test to see the result.

2.

Use double square brackets ([][]) to select Sam‘s test score from the list class_name_test.

Save it to the variable sams_score.

Print the variable sams_score to see the result.

3.

Use double square brackets ([][]) to select Ellies test score from the list class_name_test. This time only use negative indices!

Save it to the variable ellies_score.

Print the variable ellies_score to see the result.

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