Day 019

Udemy Python Bootcamp Day 019

Functions as Inputs

def function_a(something):
	#Do this with something
    #Then do this
    #Finally do this
    
def function_b():
	#Do this
    
function_a(function_b)

Event Listeners

from turtle import Turtle, Screen

tim = Turtle()
screen = Screen()


def move_forwards():
    tim.forward(10)

screen.listen()
screen.onkey(key="space", fun=move_forwards)
screen.exitonclick()

.listen(): Set focus on TurtleScreen (in order to collect key-events).

.onkey() parameters

• fun: a function with no arguments or None
• key: a string: key (e.g. “a”) or key-symbol (e.g. “space”)
  
  

Etch-A-Sketch App

from turtle import Turtle, Screen

tim = Turtle()
screen = Screen()


def move_forwards():
    tim.forward(10)

def move_backwards():
    tim.backward(10)

def turn_left():
    new_heading = tim.heading() + 10
    tim.setheading(new_heading)

def turn_right():
    new_heading = tim.heading() - 10
    tim.setheading(new_heading)

def clear():
    tim.clear()
    tim.penup()
    tim.home()
    tim.pendown()

screen.listen()
screen.onkey(move_forwards, "w")
screen.onkey(move_backwards, "s")
screen.onkey(turn_left, "a")
screen.onkey(turn_right, "d")
screen.onkey(clear, "c")

screen.exitonclick()

Turtle Race

from turtle import Turtle, Screen

screen = Screen()
screen.setup(width=500, height=400)
user_bet = screen.textinput(title="Make your bet", prompt="Which turtle will win the race? Enter a color: ")
colors = ["red", "orange", "yellow", "green", "blue", "purple"]
y_position = [-70, -40, -10, 20, 50, 80]

for turtle_index in range(6):
    tim = Turtle(shape="turtle")
    tim.color(colors[turtle_index])
    tim.penup()
    tim.goto(x=-230, y=y_position[turtle_index])

screen.exitonclick()

Final

from turtle import Turtle, Screen
import random

is_race_on = False
screen = Screen()
screen.setup(width=500, height=400)
user_bet = screen.textinput(title="Make your bet", prompt="Which turtle will win the race? Enter a color: ")
colors = ["red", "orange", "yellow", "green", "blue", "purple"]
y_positions = [-70, -40, -10, 20, 50, 80]
all_turtles = []

#Create 6 turtles
for turtle_index in range(0, 6):
    new_turtle = Turtle(shape="turtle")
    new_turtle.penup()
    new_turtle.color(colors[turtle_index])
    new_turtle.goto(x=-230, y=y_positions[turtle_index])
    all_turtles.append(new_turtle)

if user_bet:
    is_race_on = True

while is_race_on:
    for turtle in all_turtles:
        #230 is 250 - half the width of the turtle.
        if turtle.xcor() > 230:
            is_race_on = False
            winning_color = turtle.pencolor()
            if winning_color == user_bet:
                print(f"You've won! The {winning_color} turtle is the winner!")
            else:
                print(f"You've lost! The {winning_color} turtle is the winner!")

        #Make each turtle move a random amount.
        rand_distance = random.randint(0, 10)
        turtle.forward(rand_distance)

screen.exitonclick()