5.10. Exercises

1. Write a program that prints We like Python's turtles! 100 times.

   for _ in range(100): print("We like Python's turtles!")

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2. Turtle objects have methods and attributes. For example, a turtle has a position and when you move the turtle forward, the position changes. Think about the other methods shown in the Summary of Turtle Methods page. Which attibutes, if any, does each method relate to? Does the method change the attribute?

3. Use for loops to make a turtle draw these regular polygons (regular means all sides the same lengths, all angles the same):

   • An equilateral triangle

   • A square

   • A hexagon (six sides)

   • An octagon (eight sides)

   # draw an equilateral triangle
   import turtle
   
   wn = turtle.Screen()
   norvig = turtle.Turtle()
   
   for i in range(3):
       norvig.forward(100)
   
       # the angle of each vertice of a regular polygon
       # is 360 divided by the number of sides
       norvig.left(360/3)
   
   wn.exitonclick()
   

   # draw a square
   import turtle
   
   wn = turtle.Screen()
   kurzweil = turtle.Turtle()
   
   for i in range(4):
       kurzweil.forward(100)
       kurzweil.left(360/4)
   
   wn.exitonclick()
   

   # draw a hexagon
   import turtle
   
   wn = turtle.Screen()
   dijkstra = turtle.Turtle()
   
   for i in range(6):
       dijkstra.forward(100)
       dijkstra.left(360/6)
   
   wn.exitonclick()
   

   # draw an octogon
   import turtle
   
   wn = turtle.Screen()
   knuth = turtle.Turtle()
   
   for i in range(8):
       knuth.forward(75)
       knuth.left(360/8)
   
   wn.exitonclick()
   

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4. Write a program to draw a shape like this:

   

   import turtle turing = turtle.Turtle() for i in range(5): turing.forward(110) turing.left(216)

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5. Write a program to draw a face of a clock that looks something like this:

   

6. Write a program to draw some kind of picture. Be creative and experiment with the turtle methods.

   import turtle tanenbaum = turtle.Turtle() tanenbaum.hideturtle() tanenbaum.speed(20) for i in range(350): tanenbaum.forward(i) tanenbaum.right(98)

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7. Create a turtle and assign it to a variable. When you print its type, what do you get?

5.10.1. Contributed Exercises

Write a program that prints I love Python! 15 times.

Turtle exercise:Ask the user for a side length and then draw a triangle with a turtle.

Turtle exercise: ask the user for a radius and then draw a circle with that radius with a turtle.

Turtle exercise: ask the user for a side length and then draw an octagon (8-sided) with a turtle.

Consider the program below which prints I love Python 10 times. To avoid hard-coding, change this program so that it asks a user for an input that specifies how many times I love Python should be printed. So if the user says 3 times, the program will print it 3 times. It should work for any input without you manually changing the code. for _ in range(10): print("I love Python")

System Message: ERROR/3 (/home/bmiller/Runestone/web2py/applications/runestone/build/preview/_sources/index.rst, line 2)

Error in “mchoice” directive: invalid option value: (option: “multiple_answers”; value: ‘true’) no argument is allowed; “true” supplied.

.. mchoice:: question1
    :multiple_answers: true

    :correct: a, b
    :answer_a: primeira resposta
    :answer_b: segunda resposta
    :answer_c: terceira resposta (errada)
    :answer_d: quarta resposta (errada)
    :feedback_a: você acertou
    :feedback_b: você acertou
    :feedback_c: você errou
    :feedback_d: você errou


    Qual a resposta correta?

#import turtle #create an instance of your turtle - give it a name you like #you MUST use a for loop in your code #think - what do you want the turtle to do 4 times??? #make sure you exit on click after the loop

Write a function to compute pi to 5000 places

print("hello world") ==== print("Hidden code, such as unit tests come after the four = signs")

Q-1: After completing the reading, what concepts are still unclear to you? If nothing is unclear, what did you find most interesting?

Write a turtle program that draws the letters LLL in green. In order to get credit you must use one loop repeating the same thing three times but at a different location, one for each L.

#Your code here

Use split (by the empty space) and join (by the “-“) to transform the string “Once upon a time” into “Once-upon-a-time”. Print your result. Write it all in one line.

#Your code here

Write a turtle program that asks the user “how many sides?”. If the number of sides is even, draw two regular polygon with that many sides, one inside the other. If the number of sides is odd, draw two regular polygons with that many sides, side by side.

#Your code here

Use the turtle module to draw an L. The side of the L should be 100 long and the width of the L should be 75 long. The top left should start at \(x=-100\), \(y=100\).

==== from unittest.gui import TestCaseGui import re class myTests(TestCaseGui): def testOne(self): self.assertIn('import turtle', self.getEditorText(), 'Contains Turtle module') self.assertIn('100', self.getEditorText(), '100 in code') self.assertIn('75', self.getEditorText(), '75 in code') myTests().main()

Turtles and Random: Write a turtle program that generates a random number of sides for a polygon between 3 and 8 (from triangle to octagon). If the number of sides is even, draw two regular polygons with that many sides, side by side, colored blue. If the number of sides is odd, draw two regular polygons with that many sides, side by side, one colored blue and the other red. Extra Credit: employ functions in your program.

#Your code here

Turtles and Random: Write a turtle program that generates a random number of sides for a polygon between 3 and 8 (from triangle to octagon). If the number of sides is even, draw two regular polygons with that many sides, side by side, colored blue. If the number of sides is odd, draw two regular polygons with that many sides, side by side, one colored blue and the other red. Extra Credit: employ functions in your program.

#Your code here

Use the turtle module to create a turtle tuck. Use tuck to draw a box with it’s center at (\(x=0\), \(y=0\)). The width of the box should be 100 and the height of the box should be 200.

==== from unittest.gui import TestCaseGui import re class myTests(TestCaseGui): def testOne(self): self.assertTrue('import turtle' in self.getEditorText(), 'Contains Turtle module') self.assertTrue('tuck' in self.getEditorText(), 'Contains tuck') self.assertTrue((tuck.xcor()**2)**.5*2==100, 'x makes sense') self.assertTrue((tuck.ycor()**2)**.5*2==200, 'y makes sense') myTests().main()

This is our shared activecode window for today’s class. We’ll be coding a DVD bouncing ball with turtles

# DVD bouncing ball demo ==== print("Hidden code, such as unit tests come after the four = signs")

Write code to ask the user for his/her name. Then use Turtle to draw “Hi!” or “Hello!” at random (not the quotes; make it look EXACTLY the same) followed by a PRINT OUT (not a drawing) of the name. Say t is the name of your turtle; use t.write(name) to write the name after Hi! or Hello!.

Write a program to draw some kind of picture. Be creative and experiment with the turtle methods.

10 points for creativity

10 points for using a for loop

10 points for using multiple colors

10 points for keeping picture inside of the window

10 points for using at least 4 turtle methods

Create a turtle and assign it to a variable. Print the type of your turtle and see what you get.

==== from unittest.gui import TestCaseGui import re class myTests(TestCaseGui): def testOne(self): answer = str(type(turtle.Turtle())) self.assertTrue(re.search(answer, self.getOutput()), 'Checking answer.') myTests().main()

Write a program that prints We like Python's turtles! 100 times.

==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertIn("We like Python's turtles!", self.getEditorText(), 'Checking the message appears in the code.\nNote: Capitalization, punctuation, and spacing matter!') self.assertEqual(self.getOutput().count("We like Python's turtles!"), 100, 'Checking number of times message is printed') myTests().main()

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