1 / 12

Turtle Graphics

Turtle Graphics. Victor Norman CS104 Calvin College. Reading Quiz. Counts toward your grade. Quick Introduction to Objects. You have to instantiate the object, making a variable refer to it: turt = turtle.Turtle () You call (or "invoke") methods on it: turt.forward (10)

dolan-poole
Download Presentation

Turtle Graphics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Turtle Graphics Victor Norman CS104 Calvin College

  2. Reading Quiz • Counts toward your grade.

  3. Quick Introduction to Objects • You have to instantiate the object, making a variable refer to it: • turt = turtle.Turtle() • You call (or "invoke") methods on it: • turt.forward(10) • turt.doSomething(33, 22, 11) • It is like asking the object to do something to itself: give me back a value or move yourself, or draw something, or change a value. • The object stores its own state (or characteristics, properties, or attributes).

  4. Clicker Question

  5. for Loop Syntax • Pattern: for <var> in <sequence>: <body> # multiple statements • Examples: for aVal in [3, 11, 22, 0, -3]: print(aVal) for aVal in [“I’m”, “a”, “lumberjack”, “and”, “I’m”, “ok”, 8, math.pi]: print(aVal)

  6. for Loop Examples for val in [0, 1, 2, 3, 4, 5]: turt.forward(50) turt.left(60) total = 0 for val in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]: total = total + val print(total) total = 0 for val in range(1, 21): total = total + val print(total)

  7. range(start, stop, step) • Built-in function • Generates list of integers starting at start, going up to (but not including) stop, by increments of step. • Can skip start  uses 0. E.g., range(10) • Can skip step  uses 1. E.g., range(3, 7)

  8. range() Examples range(30) • generates list of numbers 0, 1, 2, …, 29. range(2, 30) • generates list of numbers 2, 3, 4, 5, …, 29. range(-3, 3, 2) • generates list of numbers -3, -1, 1. range(20, 0, -1) • generates list of numbers 20, 19, 18, 17, …, 2, 1.

  9. Clicker Questions

  10. import statement • import pulls a module in to your program. • A module is a file with code and variables in it. • math module has sin(), cos(), round(), pi, e, etc. • myro has init(), forward(), backward(), etc. • import loads the module in, but all the stuff in it is still in it. Access it via the “dot operator”. • import loads the “box” in but your code still has to reach into the box to get at the functions, variables, etc. • e.g., math.sin(), math.pi

  11. import (cont) • If you want to pull something (everything) out of the “box”, you can do this from math import *from math import sin • Then you don’t need to tell your code to reach into the module to get the function/variable. • e.g., can use sin() instead of math.sin() • init() instead of myro.init().

  12. Assignments • Do the few TuringsCraft questions before lab on Thursday.

More Related