关于#python#的问题：请问这段python运行为什么gui界面无法显示呢

请问这段python运行为什么gui界面无法显示呢？

如果我把这些线程都关掉的话就会显示gui界面，我该如何修改才可以既可以让线程运行又让gui显示呢？

第三个Thread的target为啥有（）呢

• 这个问题的回答你可以参考下: https://ask.csdn.net/questions/7660763
• 除此之外, 这篇博客: 桌面太单调？一起用Python做个自定义动态壁纸，竟然还可以放视频！中的 1. UI排版布局设计 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:
  

• 根据动态壁纸所需要的功能，首先进行UI布局设计，我们这次还是使用的pyqt5。主要包含了加载读取本地视频、视频加载预览、动态壁纸应用、动态壁纸关闭等。核心设计代码如下：

  # author：CSDN-Dragon少年
  def setupUi(self, MainWindow):
      MainWindow.setObjectName("MainWindow")
      MainWindow.resize(505, 615)
      MainWindow.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly)
      self.centralwidget = QtWidgets.QWidget(MainWindow)
      self.centralwidget.setObjectName("centralwidget")
      self.pushButton = QtWidgets.QPushButton(self.centralwidget)
      self.pushButton.setGeometry(QtCore.QRect(22, 10, 89, 31))
      self.pushButton.setObjectName("pushButton")
      self.pushButton.clicked.connect(self.openmp4)
      self.pushButton.setStyleSheet(
          '''QPushButton{background:#F7D674;border-radius:5px;}QPushButton:hover{background:yellow;}''')
      self.groupBox = QtWidgets.QGroupBox(self.centralwidget)
      self.groupBox.setGeometry(QtCore.QRect(22, 50, 452, 351))
      self.groupBox.setObjectName("groupBox")
      self.widget = QtWidgets.QWidget(self.groupBox)
      self.widget.setGeometry(QtCore.QRect(11, 20, 430, 291))
      self.widget.setObjectName("widget")
      self.gridLayout_3 = QtWidgets.QGridLayout(self.widget)
      self.gridLayout_3.setObjectName("gridLayout_3")
      self.label = QLabel(self)
      self.label.resize(400, 300)
      self.label.setText("Waiting for video...")
      self.gridLayout_3.addWidget(self.label)
      self.close_widget = QtWidgets.QWidget(self.centralwidget)
      self.close_widget.setGeometry(QtCore.QRect(420, 0, 93, 41))
      self.close_widget.setObjectName("close_widget")
      self.close_layout = QGridLayout()  # 创建左侧部件的网格布局层
      self.close_widget.setLayout(self.close_layout)  # 设置左侧部件布局为网格
      self.left_close = QPushButton("")  # 关闭按钮
      self.left_close.clicked.connect(self.close)
      self.left_visit = QPushButton("")  # 空白按钮
      #self.left_visit.clicked.connect(MainWindow.big)
      self.left_mini = QPushButton("")  # 最小化按钮
      self.left_mini.clicked.connect(MainWindow.mini)
      self.close_layout.addWidget(self.left_mini, 0, 0, 1, 1)
      self.close_layout.addWidget(self.left_close, 0, 2, 1, 1)
      self.close_layout.addWidget(self.left_visit, 0, 1, 1, 1)
      self.left_close.setFixedSize(15, 15)  # 设置关闭按钮的大小
      self.left_visit.setFixedSize(15, 15)  # 设置按钮大小
      self.left_mini.setFixedSize(15, 15)  # 设置最小化按钮大小
      self.left_close.setStyleSheet(
          '''QPushButton{background:#F76677;border-radius:5px;}QPushButton:hover{background:red;}''')
      self.left_visit.setStyleSheet(
          '''QPushButton{background:#F7D674;border-radius:5px;}QPushButton:hover{background:yellow;}''')
      self.left_mini.setStyleSheet(
          '''QPushButton{background:#6DDF6D;border-radius:5px;}QPushButton:hover{background:green;}''')
      self.horizontalLayout = QtWidgets.QHBoxLayout(self.close_widget)
      self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
      self.horizontalLayout.setObjectName("horizontalLayout")
      self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
      self.pushButton_2.setGeometry(QtCore.QRect(77, 440, 133, 41))
      self.pushButton_2.setObjectName("pushButton_2")
      self.pushButton_2.clicked.connect(self.play)
      self.pushButton_2.setStyleSheet(
          '''QPushButton{background:#6DDF6D;border-radius:5px;}QPushButton:hover{background:green;}''')
      self.pushButton_3 = QtWidgets.QPushButton(self.centralwidget)
      self.pushButton_3.setGeometry(QtCore.QRect(308, 440, 111, 41))
      self.pushButton_3.setObjectName("pushButton_3")
      self.pushButton_3.clicked.connect(self.close_wall)
      self.pushButton_3.setStyleSheet(
          '''QPushButton{background:#F76677;border-radius:5px;}QPushButton:hover{background:red;}''')
      self.pushButton_4 = QtWidgets.QPushButton(self.centralwidget)
      self.pushButton_4.setGeometry(QtCore.QRect(187, 540, 133, 21))
      self.pushButton_4.setObjectName("pushButton_4")
      self.pushButton_4.clicked.connect(self.openurl)
      self.pushButton_4.setStyleSheet(
          '''QPushButton{background:#222225;color:white;border-radius:5px;}QPushButton:hover{background:#222225;color:skyblue}''')
      MainWindow.setCentralWidget(self.centralwidget)
      self.menubar = QtWidgets.QMenuBar(MainWindow)
      self.menubar.setGeometry(QtCore.QRect(0, 0, 505, 23))
      self.menubar.setObjectName("menubar")
      MainWindow.setMenuBar(self.menubar)
      self.statusbar = QtWidgets.QStatusBar(MainWindow)
      self.statusbar.setObjectName("statusbar")
      MainWindow.setStatusBar(self.statusbar)
      self.retranslateUi(MainWindow)
      QtCore.QMetaObject.connectSlotsByName(MainWindow)
      self.groupBox.setStyleSheet('''
      color:white
      ''')
      MainWindow.setWindowOpacity(0.95)  # 设置窗口透明度
      MainWindow.setAttribute(Qt.WA_TranslucentBackground)
      MainWindow.setWindowFlag(Qt.FramelessWindowHint)  # 隐藏边框
  # author：Dragon少年
  def retranslateUi(self, MainWindow):
      _translate = QtCore.QCoreApplication.translate
      MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
      self.pushButton.setText(_translate("MainWindow", "从本地选择"))
      self.groupBox.setTitle(_translate("MainWindow", "预览"))
      self.pushButton_2.setText(_translate("MainWindow", "应用"))
      self.pushButton_3.setText(_translate("MainWindow", "关闭壁纸"))
      self.pushButton_4.setText(_translate("MainWindow", "在线资源"))
  

  UI实现效果如下：
  
  UI布局设计完成，下面我们开始进行视频读取加载、预览功能实现。