Outline for January 11

Reading: Wentworth et al., §3.1, 3.4.1
Due: Homework 1, due on January 18 at 11:55pm

1. chaos program, incomplete version [chaos.py]
   1. Comments
   2. Function input() gets input as a string from user
   3. Function float() converts data to a floating point number
   4. Assignment to variable; evaluate right hand side first
   5. For loop generally
      1. Built-in range() function
      2. Index variable i initialized to 0
      3. Expression using multiplication, subtraction, and variables
      4. Printing a number
   6. Behavior with initial values of 0.25 and 0.26
   7. Lack of error checking: what happens if I enter -0.01?
2. Turtle graphics
   1. What turtle is; import turtle
3. Drawing a figure: a box with a hat [tbox.py]
   1. Set up the window to draw in: Screen()
   2. Create the turtle: Turtle
   3. Cursor for drawing
   4. Move cursor forward: forward, backward()
   5. Turn cursor: left(), right()
   6. Wait for the window to close: mainloop()
4. Titles, background, and such [tfancybox.py]
   1. Window
      1. Color of the window background: background()
      2. Title of the window: title
   2. Turtle, more properly called “pen”
      1. Shape of the turtle: shape()
      2. Speed of the drawing: speed()
      3. Color of the drawn line: color()
      4. Thickness of the line (pixels): pensize()
      5. Hide the turtle: hideturtle()
5. Plotting points and graphing
   1. Drawing lines: penup(), pendown()
   2. Move turtle: setpos()
   3. Write text: write()
   4. Draw a dot at the current position: dot() [tchaosdots.py]
   5. Draw a line from the current position to another: goto() [tchaosline.py]

Matt Bishop Office: 2209 Watershed Science Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

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