More Turtle Repetition Practice

Section 20.6 More Turtle Repetition Practice

This section provides more practice using repetition and turtles.

Mixed up program

Checkpoint 20.6.1.

The following program uses the stamp method to create an X of turtle shapes as shown below, but the lines are mixed up. The program should do all necessary set-up, create the turtle, set the shape to “turtle”, and pick up the pen. Stamp the blue turtles before you stamp the green ones.

Arrange and indent the blocks correctly. You will not need them all.

from turtle import *
---
nick = Turtle()
nick.shape("turtle")
---
nick.penup()
---
nick.penUp()  #distractor
---
nick.goto(-150,-150)
nick.left(45)
---
nick.goto(-150,-150)
nick.left(90)  #distractor
---
nick.color("blue")
for num in range(15):
 nick.stamp()
 nick.forward(30)
---
nick.goto(150,-150)
nick.left(90)
---
nick.goto(150,-150)
nick.left(45)  #distractor
---
nick.color("green")
for num in range(14):
---
 nick.stamp()
 nick.forward(30)

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Checkpoint 20.6.2.

The following program uses the stamp method to create two squares of turtle shapes as shown below, but the lines are mixed up. The program should do all necessary set-up, create the turtle, set the shape to “turtle”, and pick up the pen. Draw the blue square before you draw the green one.

Arrange and indent the blocks correctly. You will not need them all.

from turtle import *
nick = Turtle()
nick.shape("turtle")
nick.penup()
---
nick.goto(-150,-150)
nick.left(90)
---
nick.goto(-150,-150)
nick.right(90)  #distractor
---
nick.color("blue")
for count in range(4):
 for num in range(5):
  nick.stamp()
  nick.forward(30)
 nick.right(90)
---
nick.goto(-120,-120)
nick.color("green")
for count in range(4):
---
 for num in range(3):
---
 for num in range(2):  #distractor
---
  nick.stamp()
  nick.forward(30)
---
 nick.right(90)
---
 nick.left(90)  #distractor

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Checkpoint 20.6.3.

In the program below, we want to draw a series of polygons, from 10 sides down to 3 sides, each with a side length of 100. The polygon procedure is provided as is starter code for the main part of the program. Add a loop and use it to call polygon. Make sure that you draw everything from a 10-sided to a 3-sided polygon, counting down (10, 9, 8, … 3). Each shape should have a size (side length) of 100.

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If you are having trouble, try printing out the loop counter so you can see which numbers your loop is counting through.

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Note 20.6.4.

Turtle procedure reference

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def polygon(turtleName, sides, size):
    turtleName.begin_fill()
    for s in range(sides):
        turtleName.forward(size)
        turtleName.left(360 / sides)
    turtleName.end_fill()

# main program
from turtle import *
lucia = Turtle()
lucia.speed(0)
lucia.penup()
lucia.fillcolor("lavender")
lucia.goto(-50, -150)
lucia.pendown()

# Add your code here to make a loop that counts down from 10 to 3 by -1
____________________________
    # Inside the loop - use your loop variable as the second parameter to control the number of sides
    polygon(lucia, ____, 100)
====
from unittest.gui import TestCaseGui

class myTests(TestCaseGui):
    def testOne(self):
        self.assertRegex(self.getEditorText(), r"for \w+ in range.*:", "Testing that you created a loop.")
        self.assertRegex(self.getEditorText(), r"range\s*\(\s*\d+\s*,\s*2\s*", "Testing that your loop stops at the right value.")
        self.assertRegex(self.getEditorText(), r"range\s*\(\s*\d+\s*,\s*\d+\s*,\s*-1\s*", "Testing that your loop counts down.")
        self.assertRegex(self.getEditorText(), r"\s+polygon\(\s*lucia", "Testing that you call polygon with lucia")
        self.assertRegex(self.getEditorText(), r"\s+polygon\(\s*lucia\s*,\s*\w+", "Testing that you use the loop variable in the call")
        self.assertRegex(self.getEditorText(), r"\s+polygon\(\s*lucia\s*,\s*\w+\s*,\s*100\s*\)", "Testing that you specify size 100")

myTests().main()

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You have attempted 1 of 4 activities on this page.

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