python面向对象编程
、
给定一个重力加速度的值，请你输出一个物体自由落体 010 秒内下落的距离。不妨请10 秒内下落的距离，均保留 2 位小数，并用空格隔
使用__call__方法。
输入：一行，一个数字，代表重力加速度
输出：一行，11 个数字，分别代表 0
开。
- 这有个类似的问题, 你可以参考下: https://ask.csdn.net/questions/7798719
- 我还给你找了一篇非常好的博客，你可以看看是否有帮助，链接：编写Python程序：给定一个整数，将其转为罗马数字。输入确保在 1 到 3999 的范围内
- 除此之外, 这篇博客: 用了都说好的Python专属无广告视频播放器，良心到想为它疯狂打call中的 正文 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
本文是基于Pyqt5的界面化小程序专属播放器，大家可以多多优化修改界面使其更完美吖！
准备好简单的播放器素材按钮：
附主源码：
class VideoPlayer(QWidget): def __init__(self, parent=None, **kwargs): super(VideoPlayer, self).__init__(parent) # 初始化窗口 self.setWindowTitle('专属视频播放器 ') self.setWindowIcon(QIcon(os.path.join(os.getcwd(), 'images/icon.png'))) self.setGeometry(300, 50, 810, 600) self.setWindowFlags(Qt.WindowCloseButtonHint | Qt.WindowMinimizeButtonHint) palette = QPalette() palette.setColor(QPalette.Background, Qt.gray) self.setPalette(palette) # 定义组件 # --视频播放插件 self.video_widget = QVideoWidget(self) self.video_widget.setGeometry(QRect(5, 5, 800, 520)) palette = QPalette() palette.setColor(QPalette.Background, Qt.black) self.video_widget.setPalette(palette) self.video_widget.setStyleSheet('background-color:#000000') self.player = QMediaPlayer(self) self.player.setVideoOutput(self.video_widget) self.player.setVolume(50) # --当前的视频路径 self.video_line_edit = QLineEdit('') # --选择视频按钮 self.select_video_btn = QPushButton('选择') # --播放按钮 self.play_btn = QPushButton(self) self.play_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/play.png'))) self.play_btn.setIconSize(QSize(25, 25)) self.play_btn.setStyleSheet('''QPushButton{border:none;}QPushButton:hover{border:none;border-radius:35px;}''') self.play_btn.setCursor(QCursor(Qt.PointingHandCursor)) self.play_btn.setToolTip('播放') self.play_btn.setFlat(True) # --暂停按钮 self.pause_btn = QPushButton('') self.pause_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/pause.png'))) self.pause_btn.setIconSize(QSize(25, 25)) self.pause_btn.setStyleSheet('''QPushButton{border:none;}QPushButton:hover{border:none;}''') self.pause_btn.setCursor(QCursor(Qt.PointingHandCursor)) self.pause_btn.setToolTip('暂停') self.pause_btn.setFlat(True) self.pause_btn.hide() # --播放进度 self.play_progress_label = QLabel('00:00 / 00: 00') self.play_progress_slider = QSlider(Qt.Horizontal, self) self.play_progress_slider.setMinimum(0) self.play_progress_slider.setSingleStep(1) self.play_progress_slider.setGeometry(QRect(0, 0, 200, 10)) # --音量控制 self.volume_slider = QSlider(Qt.Horizontal) self.volume_slider.setMinimum(0) self.volume_slider.setMaximum(100) self.volume_slider.setValue(50) self.mute_btn = QPushButton('') self.mute_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/sound.png'))) self.mute_btn.setIconSize(QSize(25, 25)) self.mute_btn.setStyleSheet('''QPushButton{border:none;}QPushButton:hover{border:none;}''') self.mute_btn.setCursor(QCursor(Qt.PointingHandCursor)) self.mute_btn.setToolTip('禁音') self.mute_btn.setFlat(True) self.volume_label = QLabel('50') # --布局 v_layout = QVBoxLayout() v_layout.setSpacing(0) v_layout.addStretch() h_layout = QHBoxLayout() h_layout.setSpacing(15) h_layout.addWidget(self.video_line_edit, 2, Qt.AlignVCenter | Qt.AlignVCenter) h_layout.addWidget(self.select_video_btn, 0, Qt.AlignCenter | Qt.AlignVCenter) v_layout.addLayout(h_layout) h_layout = QHBoxLayout() h_layout.setSpacing(2) h_layout.addWidget(self.play_btn, 0, Qt.AlignCenter | Qt.AlignVCenter) h_layout.addWidget(self.pause_btn, 0, Qt.AlignCenter | Qt.AlignVCenter) h_layout.addWidget(self.play_progress_label, 0, Qt.AlignCenter | Qt.AlignVCenter) h_layout.addWidget(self.play_progress_slider, 15, Qt.AlignVCenter | Qt.AlignVCenter) h_layout.addWidget(self.mute_btn, 0, Qt.AlignCenter | Qt.AlignVCenter) h_layout.addWidget(self.volume_slider, 0, Qt.AlignCenter | Qt.AlignVCenter) h_layout.addWidget(self.volume_label, 0, Qt.AlignCenter | Qt.AlignVCenter) v_layout.addLayout(h_layout) self.setLayout(v_layout) # 事件绑定 self.player.durationChanged.connect(self.setVideoLength) self.player.positionChanged.connect(self.setPlayProgress) self.select_video_btn.clicked.connect(self.openvideo) self.play_btn.clicked.connect(self.playvideo) self.pause_btn.clicked.connect(self.pausevideo) self.mute_btn.clicked.connect(self.mute) self.volume_slider.valueChanged.connect(self.setVolume) self.play_progress_slider.sliderPressed.connect(self.playProgressSliderPressed) self.play_progress_slider.sliderReleased.connect(self.playProgressSliderReleased) '''播放进度条按下ing事件''' def playProgressSliderPressed(self): if self.player.state() != 0: self.player.pause() '''播放进度条按下释放事件''' def playProgressSliderReleased(self): if self.player.state() != 0: self.player.setPosition(self.play_progress_slider.value()) self.player.play() '''播放视频''' def playvideo(self): if self.player.duration() == 0: return self.play_btn.hide() self.pause_btn.show() self.player.play() '''暂停视频''' def pausevideo(self): if self.player.duration() == 0: return self.play_btn.show() self.pause_btn.hide() self.player.pause() '''禁音''' def mute(self): if self.player.isMuted(): self.mute_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/sound.png'))) self.player.setMuted(False) self.volume_label.setText('50') self.volume_slider.setValue(50) self.player.setVolume(50) else: self.player.setMuted(True) self.volume_label.setText('0') self.volume_slider.setValue(0) self.mute_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/mute.png'))) '''打开视频文件''' def openvideo(self): # 打开并显示视频路径 filepath = QFileDialog.getOpenFileName(self, '请选择视频', '.') if filepath[0]: self.video_line_edit.setText(filepath[0]) # 将视频路径初始化进视频播放插件 filepath = self.video_line_edit.text() if not os.path.exists(filepath): return fileurl = QUrl.fromLocalFile(filepath) if fileurl.isValid(): self.player.setMedia(QMediaContent(fileurl)) self.player.setVolume(50) '''设置音量''' def setVolume(self): value = self.volume_slider.value() if value: self.player.setMuted(False) self.player.setVolume(value) self.volume_label.setText(str(value)) self.volume_slider.setValue(value) self.mute_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/sound.png'))) else: self.player.setMuted(True) self.volume_label.setText('0') self.volume_slider.setValue(0) self.mute_btn.setIcon(QIcon(os.path.join(os.getcwd(), 'images/mute.png'))) '''播放进度设置''' def setPlayProgress(self): _, right = self.play_progress_label.text().split('/') position = self.player.position() + 1 second = int(position / 1000 % 60) minute = int(position / 1000 / 60) left = str(minute).zfill(2) + ':' + str(second).zfill(2) self.play_progress_label.setText(left + ' /' + right) self.play_progress_slider.setValue(position) '''视频时长显示更改''' def setVideoLength(self): left, _ = self.play_progress_label.text().split('/') duration = self.player.duration() self.play_progress_slider.setMaximum(duration) second = int(duration / 1000 % 60) minute = int(duration / 1000 / 60) right = str(minute).zfill(2) + ':' + str(second).zfill(2) self.play_progress_label.setText(left + '/ ' + right) '''关闭窗口''' def closeEvent(self, event): self.player.stop() '''改变窗口大小''' def resizeEvent(self, event): size = event.size() self.video_widget.setGeometry(5, 5, size.width() - 5, size.height() - 80)
效果如下：
啊~~击中我的心脏，我“死了”~真好看~
- 您还可以看一下 jeevan老师的Python量化交易，大操手量化投资系列课程之内功修炼篇课程中的 讲师简介，量化交易介绍及自动化交易演示小节, 巩固相关知识点