Being ReaLISTic

Table of Contents

Grey overlay

Pink

Green

Blue

Cream

Liliac

Purple

Yellow

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1 Lists

Learn It

  • A standard variable is handy for storing a single piece of information.
yourName='Jane'
yourAge=50
likeCrisps=True
  • Sometimes, it's handy to store several pieces of information so that we can access them all when we need them. For this, we use a list.
  • Type these commands in the INTERPRETER one at a time to get the hang of manipulating lists:
someColours=['Red','Blue','Pink','Black']

print(someColours[0])
someColours.append('Green')

print(someColours)

someColours.sort()
print(someColours)

someColours.reverse()
print(someColours)

someColours.pop()
print(someColours)

someColours.pop(1)
print(someColours)
  • You can type the commands into this Trinket, if you find it easier…

Code It

  • Using lists, we can get more flexibility over the patterns we can create.
import turtle

wn = turtle.Screen()
wn.bgcolor("white") 
wn.title("List Practice")

tess = turtle.Turtle()
tess.pensize(5)

def colouredSquare(sideLength,newColour):
    tess.color(newColour)
    for x in range(4):
	tess.forward(sideLength)
	tess.left(90)

colourList=['red','green','blue','orange','hotpink','purple']

for eachColour in colourList:
    colouredSquare(75,eachColour)  # Draw a square in the current colour.

    # The len() function will tell you how long a list is, or how many characters are in a string.
    # I'm using it here to calculate the angle I need, based on the size of the list.
    tess.left(360/len(colourList))

wn.mainloop()
  • As always, this Trinket may be handy to use to experiment with…

2 Assessment

Badge It

  • Silver: Modify the code to draw the first square with side lengths of 20, the second with size 40, third with 60 and so on.
  • Gold: Change the code so that the user can enter five colours that are used to draw a pattern of your choice.
  • Platinum: Change the code so that the user can enter as many colours as they like, and have a shape drawn with that many sides. E.g.
Name a Python colour (XYZ when done): red
Name a Python colour (XYZ when done): blue
Name a Python colour (XYZ when done): green
Name a Python colour (XYZ when done): XYZ
Here goes...

w5.png

  • Tip: You'll need to use a WHILE loop to make this work.