Your instructor may assign one or more of the following problems. Don’t feel that you must do all the problems; for the homeworks, you are only required to do those that are explicitly assigned via Moodle.

1. Write a program called turtle_directions.py that prompts the user for a file name containing directions for a turtle, and then uses turtle graphics to execute the directions. The file of directions will have one command per line. Valid command formats are as follows:
   • penup
   • pendown
   • color color_name
   • goto x y
   • point size x y
   • a blank line or a line with just whitespace
   • a comment line, in which the first non-whitespace character is #.
   where
   • color_name is one of green, red, pink, purple, black or blue
   • x is an integer
   • y is an integer
   • size is an integer between 5 and 20 (inclusive)

   NOTE: The "point" should be drawn using the turtle method dot.
   NOTE: a line may have extra spaces at the beginning or end.
   Include with your submission a sample file of directions that uses each command at least once.

2. Extend your circle class from the previous homework in the following ways.

   • Make a copy of your circle.py solution and modify it so that the testing code at the bottom of the file, outside of the class definition, is not run when the circle module is loaded by other programs.
   • Create a new text file, called circles.txt, that contains specifications for circle objects of the following form:

     0 0 100 black unfilled
     100 0 10 gold filled
     130 20 20 blue filled

     Note that each row provides the values required to specify a new circle object.
   • Write a circle_driver.py program that imports the circle module, reads the contents of circles.txt, creates a list of circles as specified and draws them using the turtle.
   • Write a circle_write.py program that writes a set of hard-coded circle specifications to the circles.txt file.

   With these things in place, you should be able to run circle_write.py to create a new circles.txt file and then run circle_driver.py to print those circles using the Python turtle.

3. Extend your rectangle class from the previous homework in the following ways.

   • Make a copy of your rectangle.py solution and modify it so that the testing code at the bottom of the file, outside of the class definition, is not run when the circle module is loaded by other programs.
   • Alternatively, you may use my solution: rectangle.py
   • Create a new text file, called rectangles.txt, that contains specifications for rectangle objects of the following form:

     0 0 100 50 black
     100 0 10 50 gold
     130 20 20 50 blue

     Note that each row provides the values required to specify a new rectangle object.
   • Write a rectangle_driver.py program that imports the rectangle module, reads the contents of rectangles.txt, creates a list of rectangles as specified and draws them using the turtle.
   • Write a rectangle_write.py program that writes a set of hard-coded circle specifications to the rectangles.txt file.

   With these things in place, you should be able to run rectangle_write.py to create a new rectangles.txt file and then run rectangle_driver.py to print those rectangles using the Python turtle.

Checking In

Submit all appropriate files for grading, including code files, screen captures, supplemental files (e.g., image files), and text files. We will grade this exercise according to the following criteria:

• Correctness:
  • 10% - Any modules used are created and imported properly.
  • 20% - If appropriate, the user interface is implemented as specified.
  • 50% - The files are created and read properly.
• Understandability:
  • 5% - If appropriate, a sample file that demonstrates the functionality is provided.
  • 5% - Code Documentation - Separate the logical blocks of your program with useful comments and white space.
  • 5% - Header Documentation - Document the code’s basic purpose, authors and assignment number.
  • 5% - Documentation strings - Include appropriate documentation strings for any methods