TGGS Computer Science

Spring 1 - Lesson 6 - Lists and For Loops(2)

🎯 Learning Objectives

🎯 We are learning to iterate through the items in a 1 dimensional list

🎯 We are learning how to access items from a record

Outcomes

  • We will be able to iterate through the items of a 1 dimensional list
  • We will be able to describe the relationship between i and the list item output
  • We will be able to output individual items from a record
🐍 Activity 1 – Iterating through a list (recap)

🔎 You have been given a list

Each item in the list is an important character from the novel Frankenstein

frank = ["Dr Frankenstein", "The Creature", "Elizabeth L", "Henry C", "Robert W"]

🐍 Coding (1): Create a for loop

Create a for loop where:

  • i starts off equal to index number of the first item in the list (0)
  • The loop ends when i is the the same as the length of the list (5)
Click to see how this should look 
for i in range(0, 5):

🐍 Coding 2: Creating the output

Create an output (use the print() function)

  • The output should contain a list item e.g. listname[0]
  • Except, the number is replaced with the loop counter variable (i)
  • It should also contain a meaningful message e.g. "is an important character in Frankenstein"
  • Make sure you indent any line of code inside the for loop
Click to see how this should look 
for i in range(0, 5):
    print(f"{frank[i]} is an important character in Frankenstein")

▶️ Runing the code

Run the code and you should see this output:

Dr Frankenstein is an important character in Frankenstein
The Creature is an important character in Frankenstein
Elizabeth L is an important character in Frankenstein
Henry C is an important character in Frankenstein
Robert W is an important character in Frankenstein
🐍 Activity 2 – Iterating through a list independently

🐍 Iterate through a list (independent practice)

You have been given a list of items Sue bought from the green grocer

bought = ["🍎 Apple", "🍐 Pear", "🍊 Orange", "🥕 Carrot", "🥬 Lettuce", "🧅 Onion"]

You must write some code that:

  • Iterates through each item in the list
  • Outputs "A delicious [[[Name of the item]]]"
✍️ Activity 3 – Answer some questions

✍️ Answer some questions

  • You have been given some code to examine
  • Beneath it are some questions
  • Answer questions 3 and 4 with as much detail as you can
🐍 Activity 4 – Output items from a record

🔎 A list made of records

You have been given a 2 dimensional list

This is made of 4 records (smaller lists inside a larger list)

Each record contains two items [Name of the historical figure, their role in the norman conquest]

p1066 = [
    ["Edward the Confessor", "King of England who died in 1066"],
    ["Harold Godwinson", "Anglo-Saxon king of England"],
    ["William of Normandy", "Norman leader who invaded England"], 
    ["Harald Hardrada", "Viking king of Norway"]
]

🐍 Coding (1): Output the entire first record

Write the following code

print("This is the entire first record")
print(p1066[0])

Run it ▶️

You should see this:

This is the entire first record
['Edward the Confessor', 'King of England who died in 1066']

🐍 Coding (2): Output the first item of the third record

Write the following code

print("This is the first item of the third record")
print(p1066[2][0])

Run it ▶️

You should see this:

This is the first item of the third record
William of Normandy

🐍 Coding (3): Output the second item of the third record

Write the following code

print("This is the second item of the third record")
print(p1066[2][1])

Run it ▶️

You should see this:

This is the second item of the third record
Norman leader who invaded England

🐍 Coding (4): Output the first and second items of the third record together as a meaningful output.

Write the following code

print("This outputs the contents of the third record as a meaningful statement")
print(f"{p1066[2][0]} was the {p1066[2][1]}")

Run it ▶️

You should see this:

This outputs the contents of the third record as a meaningful statement
William of Normandy was the Norman leader who invaded England

🐍 Coding (5): Complete the independent tasks

Complete the indepenent tasks

Use what you have just learned

#--------------------- Independent Tasks ----------------------

#====> Output the entire fourth record

#====> Output the first and second items of the fourth record together
#====> as a meaningful output.

#====> Output the first and second items of the first record together
#====> as a meaningful output.
✨ Extension - Iterating through a 2 dimensional list

Extension Activity

You have been given a 2 dimensional list

animals = [
    ["Lion", "Mammal"],
    ["Elephant", "Mammal"],
    ["Gecko", "Reptile"],
    ["Snake", "Reptile"],
    ["Salmon", "Fish"], 
    ["Shark", "Fish"],
    ["Heron", "Bird"],
    ["Eagle", "Bird"],
    ["Wasp", "Insect"],
    ["Ant", "Insect"]
]

You must write code that:

  • Iterates through each record
  • Outputs the first item and second item of each record
  • Accompanies both items with a meaningful message

Try to work it out yourself, but here is the code if you want to see

Click to see the completed code 
for i in range(0, 10):
    print(f"{animals[i][0]} is a type of {animals[i][1]}")