{"id":1024812,"date":"2024-12-30T14:17:01","date_gmt":"2024-12-30T06:17:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1024812.html"},"modified":"2024-12-30T14:17:04","modified_gmt":"2024-12-30T06:17:04","slug":"python%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e6%82%ac%e6%b5%ae%e7%90%83-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1024812.html","title":{"rendered":"python\u5982\u4f55\u5b9e\u73b0\u60ac\u6d6e\u7403"},"content":{"rendered":"

\"python\u5982\u4f55\u5b9e\u73b0\u60ac\u6d6e\u7403\"<\/p>\n

Python\u5b9e\u73b0\u60ac\u6d6e\u7403\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528PyQt5\u3001Tkinter\u3001Kivy\u7b49\u56fe\u5f62\u7528\u6237\u754c\u9762\u5e93\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u662fPyQt5\u3001Tkinter\u3002<\/strong><\/p>\n<\/p>\n

\u5176\u4e2d\uff0cPyQt5\u662f\u4e00\u79cd\u6d41\u884c\u7684Python GUI\u5e93\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u7ec4\u4ef6\u548c\u529f\u80fd\u6765\u521b\u5efa\u590d\u6742\u7684\u56fe\u5f62\u7528\u6237\u754c\u9762\u3002\u901a\u8fc7\u4f7f\u7528PyQt5\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u521b\u5efa\u60ac\u6d6e\u7403\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u60ac\u6d6e\u7403\u4e0a\u6dfb\u52a0\u5404\u79cd\u529f\u80fd\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528PyQt5\u5b9e\u73b0\u60ac\u6d6e\u7403\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528PyQt5\u5b9e\u73b0\u60ac\u6d6e\u7403<\/h2>\n<\/p>\n

1\u3001\u5b89\u88c5PyQt5<\/h3>\n<\/p>\n

\u9996\u5148\uff0c\u9700\u8981\u5b89\u88c5PyQt5\u5e93\u3002\u53ef\u4ee5\u901a\u8fc7pip\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n

pip install PyQt5<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u521b\u5efa\u60ac\u6d6e\u7403\u7a97\u53e3<\/h3>\n<\/p>\n
\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u7a97\u53e3\uff0c\u5e76\u4f7f\u5176\u6210\u4e3a\u4e00\u4e2a\u60ac\u6d6e\u7a97\u53e3\u3002PyQt5\u63d0\u4f9b\u4e86\u4e00\u4e2aQMAI<\/a>nWindow\u7c7b\uff0c\u53ef\u4ee5\u7528\u6765\u521b\u5efa\u4e3b\u7a97\u53e3\u3002\u60ac\u6d6e\u7403\u9700\u8981\u4e00\u4e2a\u900f\u660e\u7684\u80cc\u666f\uff0c\u6240\u4ee5\u9700\u8981\u8bbe\u7f6e\u7a97\u53e3\u7684\u900f\u660e\u5c5e\u6027\u3002<\/p>\n<\/p>\n
import sys<\/p>\n
from PyQt5.QtCore import Qt<\/p>\n
from PyQt5.QtWidgets import QApplication, QMainWindow<\/p>\n
class FloatingBall(QMainWindow):<\/p>\n
    def __init__(self):<\/p>\n
        super().__init__()<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u5c5e\u6027<\/p>\n
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.SubWindow)<\/p>\n
        self.setAttribute(Qt.WA_TranslucentBackground, True)<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u521d\u59cb\u5927\u5c0f<\/p>\n
        self.setGeometry(100, 100, 100, 100)<\/p>\n
if __name__ == '__main__':<\/p>\n
    app = QApplication(sys.argv)<\/p>\n
    floating_ball = FloatingBall()<\/p>\n
    floating_ball.show()<\/p>\n
    sys.exit(app.exec_())<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u7ed8\u5236\u60ac\u6d6e\u7403<\/h3>\n<\/p>\n
\u5728PyQt5\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u91cd\u5199paintEvent\u65b9\u6cd5\u6765\u7ed8\u5236\u81ea\u5b9a\u4e49\u7684\u56fe\u5f62\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u7ed8\u5236\u4e00\u4e2a\u5706\u5f62\u4f5c\u4e3a\u60ac\u6d6e\u7403\u3002<\/p>\n<\/p>\n
from PyQt5.QtGui import QPainter, QBrush, QColor<\/p>\n
class FloatingBall(QMainWindow):<\/p>\n
    def __init__(self):<\/p>\n
        super().__init__()<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u5c5e\u6027<\/p>\n
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.SubWindow)<\/p>\n
        self.setAttribute(Qt.WA_TranslucentBackground, True)<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u521d\u59cb\u5927\u5c0f<\/p>\n
        self.setGeometry(100, 100, 100, 100)<\/p>\n
    def paintEvent(self, event):<\/p>\n
        painter = QPainter(self)<\/p>\n
        painter.setRenderHint(QPainter.Antialiasing)<\/p>\n
        # \u7ed8\u5236\u5706\u5f62<\/p>\n
        brush = QBrush(QColor(0, 122, 255))<\/p>\n
        painter.setBrush(brush)<\/p>\n
        painter.drawEllipse(0, 0, self.width(), self.height())<\/p>\n
<\/code><\/pre>\n<\/p>\n
4\u3001\u5b9e\u73b0\u62d6\u52a8\u529f\u80fd<\/h3>\n<\/p>\n
\u4e3a\u4e86\u4f7f\u60ac\u6d6e\u7403\u80fd\u591f\u62d6\u52a8\uff0c\u9700\u8981\u91cd\u5199\u9f20\u6807\u4e8b\u4ef6\u65b9\u6cd5\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u9700\u8981\u91cd\u5199mousePressEvent\u3001mouseMoveEvent\u548cmouseReleaseEvent\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
class FloatingBall(QMainWindow):<\/p>\n
    def __init__(self):<\/p>\n
        super().__init__()<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u5c5e\u6027<\/p>\n
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.SubWindow)<\/p>\n
        self.setAttribute(Qt.WA_TranslucentBackground, True)<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u521d\u59cb\u5927\u5c0f<\/p>\n
        self.setGeometry(100, 100, 100, 100)<\/p>\n
        # \u521d\u59cb\u5316\u9f20\u6807\u6309\u4e0b\u7684\u4f4d\u7f6e<\/p>\n
        self.mouse_press_position = None<\/p>\n
    def paintEvent(self, event):<\/p>\n
        painter = QPainter(self)<\/p>\n
        painter.setRenderHint(QPainter.Antialiasing)<\/p>\n
        # \u7ed8\u5236\u5706\u5f62<\/p>\n
        brush = QBrush(QColor(0, 122, 255))<\/p>\n
        painter.setBrush(brush)<\/p>\n
        painter.drawEllipse(0, 0, self.width(), self.height())<\/p>\n
    def mousePressEvent(self, event):<\/p>\n
        if event.button() == Qt.LeftButton:<\/p>\n
            self.mouse_press_position = event.globalPos() - self.frameGeometry().topLeft()<\/p>\n
    def mouseMoveEvent(self, event):<\/p>\n
        if Qt.LeftButton and self.mouse_press_position:<\/p>\n
            self.move(event.globalPos() - self.mouse_press_position)<\/p>\n
    def mouseReleaseEvent(self, event):<\/p>\n
        self.mouse_press_position = None<\/p>\n
<\/code><\/pre>\n<\/p>\n
5\u3001\u6dfb\u52a0\u529f\u80fd\u6309\u94ae<\/h3>\n<\/p>\n
\u53ef\u4ee5\u5728\u60ac\u6d6e\u7403\u4e0a\u6dfb\u52a0\u529f\u80fd\u6309\u94ae\uff0c\u4f8b\u5982\u5173\u95ed\u6309\u94ae\u3002PyQt5\u63d0\u4f9b\u4e86QPushButton\u7c7b\uff0c\u53ef\u4ee5\u7528\u6765\u521b\u5efa\u6309\u94ae\u3002<\/p>\n<\/p>\n
from PyQt5.QtWidgets import QPushButton<\/p>\n
class FloatingBall(QMainWindow):<\/p>\n
    def __init__(self):<\/p>\n
        super().__init__()<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u5c5e\u6027<\/p>\n
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.SubWindow)<\/p>\n
        self.setAttribute(Qt.WA_TranslucentBackground, True)<\/p>\n
        # \u8bbe\u7f6e\u7a97\u53e3\u7684\u521d\u59cb\u5927\u5c0f<\/p>\n
        self.setGeometry(100, 100, 100, 100)<\/p>\n
        # \u521d\u59cb\u5316\u9f20\u6807\u6309\u4e0b\u7684\u4f4d\u7f6e<\/p>\n
        self.mouse_press_position = None<\/p>\n
        # \u6dfb\u52a0\u5173\u95ed\u6309\u94ae<\/p>\n
        self.close_button = QPushButton('X', self)<\/p>\n
        self.close_button.setGeometry(75, 10, 20, 20)<\/p>\n
        self.close_button.clicked.connect(self.close)<\/p>\n
    def paintEvent(self, event):<\/p>\n
        painter = QPainter(self)<\/p>\n
        painter.setRenderHint(QPainter.Antialiasing)<\/p>\n
        # \u7ed8\u5236\u5706\u5f62<\/p>\n
        brush = QBrush(QColor(0, 122, 255))<\/p>\n
        painter.setBrush(brush)<\/p>\n
        painter.drawEllipse(0, 0, self.width(), self.height())<\/p>\n
    def mousePressEvent(self, event):<\/p>\n
        if event.button() == Qt.LeftButton:<\/p>\n
            self.mouse_press_position = event.globalPos() - self.frameGeometry().topLeft()<\/p>\n
    def mouseMoveEvent(self, event):<\/p>\n
        if Qt.LeftButton and self.mouse_press_position:<\/p>\n
            self.move(event.globalPos() - self.mouse_press_position)<\/p>\n
    def mouseReleaseEvent(self, event):<\/p>\n
        self.mouse_press_position = None<\/p>\n
<\/code><\/pre>\n<\/p>\n
6\u3001\u8fd0\u884c\u7a0b\u5e8f<\/h3>\n<\/p>\n
\u901a\u8fc7\u8fd0\u884c\u4ee5\u4e0b\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u5230\u4e00\u4e2a\u53ef\u4ee5\u62d6\u52a8\u7684\u60ac\u6d6e\u7403\uff0c\u5e76\u4e14\u5e26\u6709\u4e00\u4e2a\u5173\u95ed\u6309\u94ae\u3002<\/p>\n<\/p>\n
if __name__ == '__main__':<\/p>\n
    app = QApplication(sys.argv)<\/p>\n
    floating_ball = FloatingBall()<\/p>\n
    floating_ball.show()<\/p>\n
    sys.exit(app.exec_())<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528Tkinter\u5b9e\u73b0\u60ac\u6d6e\u7403<\/h2>\n<\/p>\n
\u9664\u4e86PyQt5\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528Tkinter\u6765\u5b9e\u73b0\u60ac\u6d6e\u7403\u3002Tkinter\u662fPython\u7684\u6807\u51c6GUI\u5e93\uff0c\u5c3d\u7ba1\u529f\u80fd\u76f8\u5bf9\u8f83\u5c11\uff0c\u4f46\u5bf9\u4e8e\u7b80\u5355\u7684\u60ac\u6d6e\u7403\u5b9e\u73b0\u5df2\u7ecf\u8db3\u591f\u3002<\/p>\n<\/p>\n
1\u3001\u521b\u5efa\u60ac\u6d6e\u7403\u7a97\u53e3<\/h3>\n<\/p>\n
\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684Tkinter\u7a97\u53e3\uff0c\u5e76\u4f7f\u5176\u6210\u4e3a\u4e00\u4e2a\u60ac\u6d6e\u7a97\u53e3\u3002<\/p>\n<\/p>\n
import tkinter as tk<\/p>\n
root = tk.Tk()<\/p>\n
root.overrideredirect(True)<\/p>\n
root.attributes('-toPMO<\/a>st', True)<\/p>\n
root.geometry('100x100+100+100')<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u7ed8\u5236\u60ac\u6d6e\u7403<\/h3>\n<\/p>\n
\u5728Tkinter\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Canvas\u7ec4\u4ef6\u6765\u7ed8\u5236\u56fe\u5f62\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u7ed8\u5236\u4e00\u4e2a\u5706\u5f62\u4f5c\u4e3a\u60ac\u6d6e\u7403\u3002<\/p>\n<\/p>\n
canvas = tk.Canvas(root, width=100, height=100, highlightthickness=0)<\/p>\n
canvas.pack()<\/p>\n
canvas.create_oval(0, 0, 100, 100, fill='blue')<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u5b9e\u73b0\u62d6\u52a8\u529f\u80fd<\/h3>\n<\/p>\n
\u4e3a\u4e86\u4f7f\u60ac\u6d6e\u7403\u80fd\u591f\u62d6\u52a8\uff0c\u9700\u8981\u7ed1\u5b9a\u9f20\u6807\u4e8b\u4ef6\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u9700\u8981\u7ed1\u5b9a\u3001\u548c\u4e8b\u4ef6\u3002<\/p>\n<\/p>\n
def on_press(event):<\/p>\n
    global start_x, start_y<\/p>\n
    start_x = event.x<\/p>\n
    start_y = event.y<\/p>\n
def on_drag(event):<\/p>\n
    x = root.winfo_x() + event.x - start_x<\/p>\n
    y = root.winfo_y() + event.y - start_y<\/p>\n
    root.geometry(f'+{x}+{y}')<\/p>\n
canvas.bind('<ButtonPress-1>', on_press)<\/p>\n
canvas.bind('<B1-Motion>', on_drag)<\/p>\n
<\/code><\/pre>\n<\/p>\n
4\u3001\u6dfb\u52a0\u529f\u80fd\u6309\u94ae<\/h3>\n<\/p>\n
\u53ef\u4ee5\u5728\u60ac\u6d6e\u7403\u4e0a\u6dfb\u52a0\u529f\u80fd\u6309\u94ae\uff0c\u4f8b\u5982\u5173\u95ed\u6309\u94ae\u3002Tkinter\u63d0\u4f9b\u4e86Button\u7c7b\uff0c\u53ef\u4ee5\u7528\u6765\u521b\u5efa\u6309\u94ae\u3002<\/p>\n<\/p>\n
close_button = tk.Button(root, text='X', command=root.destroy)<\/p>\n
close_button.place(x=75, y=10, width=20, height=20)<\/p>\n
<\/code><\/pre>\n<\/p>\n
5\u3001\u8fd0\u884c\u7a0b\u5e8f<\/h3>\n<\/p>\n
\u901a\u8fc7\u8fd0\u884c\u4ee5\u4e0b\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u5230\u4e00\u4e2a\u53ef\u4ee5\u62d6\u52a8\u7684\u60ac\u6d6e\u7403\uff0c\u5e76\u4e14\u5e26\u6709\u4e00\u4e2a\u5173\u95ed\u6309\u94ae\u3002<\/p>\n<\/p>\n
root.mainloop()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Kivy\u5b9e\u73b0\u60ac\u6d6e\u7403<\/h2>\n<\/p>\n
Kivy\u662f\u4e00\u4e2a\u7528\u4e8e\u5f00\u53d1\u591a\u70b9\u89e6\u63a7\u5e94\u7528\u7a0b\u5e8f\u7684\u5f00\u6e90Python\u5e93\u3002\u5b83\u5177\u6709\u8de8\u5e73\u53f0\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u5728Windows\u3001Linux\u3001MacOS\u3001iOS\u548cAndroid\u4e0a\u8fd0\u884c\u3002\u901a\u8fc7\u4f7f\u7528Kivy\uff0c\u53ef\u4ee5\u521b\u5efa\u66f4\u52a0\u590d\u6742\u548c\u7f8e\u89c2\u7684\u60ac\u6d6e\u7403\u754c\u9762\u3002<\/p>\n<\/p>\n
1\u3001\u5b89\u88c5Kivy<\/h3>\n<\/p>\n
\u9996\u5148\uff0c\u9700\u8981\u5b89\u88c5Kivy\u5e93\u3002\u53ef\u4ee5\u901a\u8fc7pip\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n
pip install kivy<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u521b\u5efa\u60ac\u6d6e\u7403\u7a97\u53e3<\/h3>\n<\/p>\n
\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684Kivy\u7a97\u53e3\uff0c\u5e76\u4f7f\u5176\u6210\u4e3a\u4e00\u4e2a\u60ac\u6d6e\u7a97\u53e3\u3002Kivy\u63d0\u4f9b\u4e86\u4e00\u4e2aApp\u7c7b\uff0c\u53ef\u4ee5\u7528\u6765\u521b\u5efa\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n
from kivy.app import App<\/p>\n
from kivy.uix.widget import Widget<\/p>\n
from kivy.core.window import Window<\/p>\n
class FloatingBallApp(App):<\/p>\n
    def build(self):<\/p>\n
        return FloatingBall()<\/p>\n
class FloatingBall(Widget):<\/p>\n
    pass<\/p>\n
if __name__ == '__main__':<\/p>\n
    FloatingBallApp().run()<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u7ed8\u5236\u60ac\u6d6e\u7403<\/h3>\n<\/p>\n
\u5728Kivy\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Canvas\u7ec4\u4ef6\u6765\u7ed8\u5236\u56fe\u5f62\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u7ed8\u5236\u4e00\u4e2a\u5706\u5f62\u4f5c\u4e3a\u60ac\u6d6e\u7403\u3002<\/p>\n<\/p>\n
from kivy.graphics import Color, Ellipse<\/p>\n
class FloatingBall(Widget):<\/p>\n
    def __init__(self, kwargs):<\/p>\n
        super().__init__(kwargs)<\/p>\n
        with self.canvas:<\/p>\n
            Color(0, 0.5, 1)<\/p>\n
            self.ellipse = Ellipse(pos=self.pos, size=(100, 100))<\/p>\n
        self.bind(pos=self.update_ellipse, size=self.update_ellipse)<\/p>\n
    def update_ellipse(self, *args):<\/p>\n
        self.ellipse.pos = self.pos<\/p>\n
        self.ellipse.size = self.size<\/p>\n
<\/code><\/pre>\n<\/p>\n
4\u3001\u5b9e\u73b0\u62d6\u52a8\u529f\u80fd<\/h3>\n<\/p>\n
\u4e3a\u4e86\u4f7f\u60ac\u6d6e\u7403\u80fd\u591f\u62d6\u52a8\uff0c\u9700\u8981\u7ed1\u5b9a\u89e6\u6478\u4e8b\u4ef6\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u9700\u8981\u91cd\u5199on_touch_down\u3001on_touch_move\u548con_touch_up\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
class FloatingBall(Widget):<\/p>\n
    def __init__(self, kwargs):<\/p>\n
        super().__init__(kwargs)<\/p>\n
        with self.canvas:<\/p>\n
            Color(0, 0.5, 1)<\/p>\n
            self.ellipse = Ellipse(pos=self.pos, size=(100, 100))<\/p>\n
        self.bind(pos=self.update_ellipse, size=self.update_ellipse)<\/p>\n
        self.touch_start_pos = None<\/p>\n
    def update_ellipse(self, *args):<\/p>\n
        self.ellipse.pos = self.pos<\/p>\n
        self.ellipse.size = self.size<\/p>\n
    def on_touch_down(self, touch):<\/p>\n
        if self.collide_point(*touch.pos):<\/p>\n
            self.touch_start_pos = touch.pos<\/p>\n
            return True<\/p>\n
        return super().on_touch_down(touch)<\/p>\n
    def on_touch_move(self, touch):<\/p>\n
        if self.touch_start_pos:<\/p>\n
            dx = touch.pos[0] - self.touch_start_pos[0]<\/p>\n
            dy = touch.pos[1] - self.touch_start_pos[1]<\/p>\n
            self.pos = (self.x + dx, self.y + dy)<\/p>\n
            self.touch_start_pos = touch.pos<\/p>\n
            return True<\/p>\n
        return super().on_touch_move(touch)<\/p>\n
    def on_touch_up(self, touch):<\/p>\n
        self.touch_start_pos = None<\/p>\n
        return super().on_touch_up(touch)<\/p>\n
<\/code><\/pre>\n<\/p>\n
5\u3001\u8fd0\u884c\u7a0b\u5e8f<\/h3>\n<\/p>\n
\u901a\u8fc7\u8fd0\u884c\u4ee5\u4e0b\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u5230\u4e00\u4e2a\u53ef\u4ee5\u62d6\u52a8\u7684\u60ac\u6d6e\u7403\u3002<\/p>\n<\/p>\n
if __name__ == '__main__':<\/p>\n
    FloatingBallApp().run()<\/p>\n
<\/code><\/pre>\n<\/p>\n
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