1 – Warm Up

After this lesson you should be able to:

• Write programs that display messages, receive keyboard input, and use simple arithmetic expressions in assignment statements
• Use selection (if-elif-else statements) to control the flow of program execution
• Locate and correct common syntax errors
• Create lists and access individual list items

In this lesson, you will:

• Brush up on your Python skills
  • Use selection (if–elif–else statements) to control the flow of program execution
  • You will walk through or write programs that display messages, receive keyboard input, and use arithmetic expressions in assignment statements
  • Create lists and access their items

• Let’s see how much Python you remember from Year 7 & 8. Create a new folder on your OneDrive in your Year 9 folder called Advanced Python.
• Download the Word document below into the folder by right clicking and “Save link as…”, then fill out the answers before we go through them as a class.

• You will be using pair programming, with each member in a pair taking on a specific role:
  • Driver: Controls the keyboard and mouse
  • Navigator: Provides support and instructions
• You will alternate between roles.

• For this activity you need a selection structure (if-elif-else) when there are multiple branches and your program needs to select which one of them to follow.

• Let’s extend this program together, to check the day and display whether it’s a weekday on not.
• Copy the code into Thonny.

print("What day is it today?")
day = int(input())

Note: The program uses an integer for each day of the week, ranging from 0 for Monday to 6 for Sunday.

• Download the Level 1 worksheet to see your task. Then copy the code below into Thonny and complete the task.

print("What day is it today?")
day = int(input())
if day <= 4:
  print("It’s a weekday")
  remaining = 
else:
  print("It’s the weekend!")

• The names for the days of the week can be stored in a list .
• What is a list? : A comma-separated list of values (items), in square brackets.
• In this example, the list items are strings (i.e. pieces of text), so they need to be in quotation marks.

• A list is a kind of data structure.
• Data structures are organised collections of data.
• In the case of lists, data is organised in a sequence, with each item having a unique index, denoting its position in the list.

• When the program is executed, this is what the list will look like in memory.
• Each item has a unique index, denoting its position in the list. You can see the index of each item on the left from 0 to 6.

• Download the Level 2/3 worksheet and copy the Python code below into Thonny one task at a time and complete it.

Task 1

months = ["January", "February",
          "March", "April", "May",
          "June", "July", "August",
          "September", "October", "November",
          "December"]
print("These are the summer months:")
print(months[ ])  # complete this line
print(months[ ])  # complete this line
print(months[ ])  # complete this line

Task 2

months = ["January", "February",
          "March", "April", "May",
          "June", "July", "August",
          "September", "October", "November",
          "December"]
print("What month is it? (1-12)")
month = int(input())
print("It is", months[ ])  # complete this line

Task 3

seasons = ["Winter", "Spring",
           "Summer", "Autumn"]
print("What month is it? (1-12)")
month = int(input())
if  :  # complete this line, type between the if and the :
  season = 0
elif  :  # complete this line
  season = 1
elif  :  # complete this line
  season = 2
else:
  season = 3
print("It is", seasons[season])

• Upload your completed Level 1 worksheet to the Teams assignment.

• Upload your completed Level 2/3 worksheet with Tasks 1 & 2 complete to the Teams assignment.

• Upload your completed Level 2/3 worksheet with Tasks 1, 2, 3 and the Explorer task complete to the Teams assignment.