《趣学Python编程》章节试读

《趣学Python编程》的笔记-第1页 - 官网地址及几个代码示例

https://www.nostarch.com/pythonforkids
turtle画星星import turtle
t = turtle.Pen()
def mystar(size, filled):
if filled:
t.begin_fill()
for x in range(1,19):
t.forward(size)
if x % 2 == 0:
t.left(175)
else:
t.left(225)
if filled:
t.end_fill()
t.color(0.9, 0.75, 0)
mystar(120, True)
t.color(0,0,0)
mystar(120, False)
turtle基本动画示例import time
from tkinter import *
tk = Tk()
canvas = Canvas(tk, width=400, height=200)
canvas.pack()
canvas.create_polygon(10, 10, 10, 60, 50, 35)
for x in range(0, 60):
canvas.move(1, 5, 0)
tk.update()
time.sleep(0.05)
弹球from tkinter import *
import random
import time
tk = Tk()
tk.title("Game")
tk.resizable(0, 0)
tk.wm_attributes("-topmost", 1)
canvas = Canvas(tk, width=500, height=400, bd=0, highlightthickness=0)
canvas.pack()
tk.update()
class Ball:
def __init__(self, canvas, paddle, color):
self.canvas = canvas
self.paddle = paddle
self.id = canvas.create_oval(10, 10, 25, 25, fill=color)
self.canvas.move(self.id, 245, 100)
starts = [-3, -2, -1, 1, 2, 3]
random.shuffle(starts)
self.x = starts[0]
self.y = -3
self.canvas_height = self.canvas.winfo_height()
self.canvas_width = self.canvas.winfo_width()
self.hit_bottom = False

def draw(self):
self.canvas.move(self.id, self.x, self.y)
pos = self.canvas.coords(self.id)
if pos[1] <= 0:
self.y = 3
if self.hit_paddle(pos) == True:
self.y = -3
if pos[3] >= self.canvas_height:
self.hit_bottom = True
if pos[0] <= 0:
self.x = 3
if pos[2] >= self.canvas_width:
self.x = -3

def hit_paddle(self, pos):
paddle_pos = self.canvas.coords(self.paddle.id)
if pos[2] >= paddle_pos[0] and pos[0] <= paddle_pos[2]:
if pos[3] >= paddle_pos[1] and pos[3] <= paddle_pos[3]:
return True
return False
class Paddle:
def __init__(self, canvas, color):
self.canvas = canvas
self.id = canvas.create_rectangle(0, 0, 100, 10, fill=color)
self.canvas.move(self.id, 200, 300)
self.x = 0
self.canvas_width = self.canvas.winfo_width()
self.canvas.bind_all('<KeyPress-Left>', self.turn_left)
self.canvas.bind_all('<KeyPress-Right>', self.turn_right)

def turn_left(self, evt):
self.x = -2

def turn_right(self, evt):
self.x = 2

def draw(self):
self.canvas.move(self.id, self.x, 0)
pos = self.canvas.coords(self.id)
if pos[0] <= 0:
self.x = 0
elif pos[2] >= self.canvas_width:
self.x = 0

paddle = Paddle(canvas, 'blue')
ball = Ball(canvas, paddle, 'red')
while 1:
if ball.hit_bottom == False:
ball.draw()
paddle.draw()
tk.update_idletasks()
tk.update()
time.sleep(0.01)