Day 20 & 21－Snake Game

learning from 100 Days of Code: The Complete Python Pro Bootcamp for 2022

inheritance

class Animal:
    def __init__(self):
        self.num_eyes = 2

    def breathe(self):
        print("Inhale, exhale.")



class Fish(Animal):
    def __init__(self):
        super().__init__() #not strictly required

    def breathe(self):
        super().breathe()
        print("doing this underwater.")

    def swim(self):
        print("moving in water.")

slicing

piano = [a, b, c, d, e, f, g]
piano_keys[2:5] # => c, d, e
piano_keys[2:5:2] # => c,e
piano_keys[::-1] # => g, f, e, d, c, b, a

# main.py

from turtle import Screen
from scoreboard import ScoreBoard
from snake import Snake
from food import Food

import time

screen = Screen()
screen.setup(width=600, height=600)
screen.title("My Snake Game")
screen.bgcolor("black")
screen.tracer(0)


snake = Snake()
food = Food()
scoreboard = ScoreBoard()


screen.listen()
screen.onkey(snake.up, "Up")
screen.onkey(snake.down, "Down")
screen.onkey(snake.left, "Left")
screen.onkey(snake.right, "Right")


game_is_on = True
while game_is_on:
    screen.update()
    time.sleep(0.1)
    snake.move()

    if snake.head.distance(food) < 15:
        food.refresh()
        scoreboard.get_score()
        snake.extend()

    if snake.head.xcor() > 290 or snake.head.xcor() < -290 or snake.head.ycor() > 290 or snake.head.ycor() < -290:
        game_is_on = False
        scoreboard.game_over()

    for segment in snake.snake[1:]:
        if snake.head.distance(segment) < 15:
            game_is_on = False
            scoreboard.game_over()


screen.exitonclick()

# snake.py

from turtle import Turtle

MOVE_DISTANCE = 20
START_POSITION = [(0, 0), (-20, 0), (-40, 0)]
UP = 90
DOWN = 270
LEFT = 180
RIGHT = 0


class Snake:

    def __init__(self):
        self.snake = []
        self.create_snake()
        self.head = self.snake[0]

    def create_snake(self):
        for position in START_POSITION:
            self.add_segment(position)

    def add_segment(self, position):
        segment = Turtle(shape="square")
        segment.color("white")
        segment.penup()
        segment.goto(position)
        self.snake.append(segment)

    def extend(self):
        self.add_segment(self.snake[-1].position())

    def move(self):
        for seg_num in range(len(self.snake) - 1, 0, -1):
            new_x = self.snake[seg_num - 1].xcor()
            new_y = self.snake[seg_num - 1].ycor()
            self.snake[seg_num].goto(new_x, new_y)
        self.snake[0].forward(MOVE_DISTANCE)

    def up(self):
        if self.head.heading() != DOWN:
            self.head.setheading(UP)

    def down(self):
        if self.head.heading() != UP:
            self.head.setheading(DOWN)

    def left(self):
        if self.head.heading() != RIGHT:
            self.head.setheading(LEFT)

    def right(self):
        if self.head.heading() != LEFT:
            self.head.setheading(RIGHT)

# food.py

from turtle import Turtle
from random import randint


class Food(Turtle):
    def __init__(self):
        super().__init__()
        self.shape("square")
        self.penup()
        self.shapesize(stretch_wid=0.5, stretch_len=0.5)
        self.color("blue")
        self.speed("fastest")
        self.refresh()

    def refresh(self):
        x_position = randint(-280, 280)
        y_position = randint(-280, 280)
        self.goto(x_position, y_position)

# scrore_board.py

from turtle import Turtle
ALIGNMENT = "center"
FONT = ('courier', 18, 'normal')


class ScoreBoard(Turtle):
    def __init__(self):
        super().__init__()
        self.score = 0
        self.color("white")
        self.hideturtle()
        self.penup()
        self.goto(0, 270)
        self.update_score()

    def update_score(self):
        self.write(f"Score: {self.score}", align=ALIGNMENT, font=FONT)

    def game_over(self):
        self.goto(0, 0)
        self.write(f"Game Over", align=ALIGNMENT, font=FONT)

    def get_score(self):
        self.score += 1
        self.clear()
        self.update_score()