PyQt5 ply B

class MainWindow(QMainWindow, Ui_MainWindow,):
    def __init__(self):
        super().__init__()

        self.setupUi(self)

        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.old_pos = None


        self.listWidget.clear()
        self.listWidget.itemClicked.connect(self.onClicked)

        self.pushbutton_close = QPushButton('✖', self)

        self.pushbutton_stop = QPushButton('✘', self)

        self.pushbutton_pause = QPushButton('■', self)

        self.pushbutton_remove = QPushButton('⏵', self)

        self.btn = QPushButton('FILE', self)


        self.itemlist = ['ВыборПапкиНаFile']
        self.listWidget.addItems(self.itemlist)

        self.pushbutton_close.clicked.connect(self.close)
        self.pushbutton_close.setStyleSheet("border:none;background-color: rgb(255, 51, 11);color: rgb(255, 255, 255);")
        self.pushbutton_close.move(200,500)
        self.pushbutton_close.setGeometry(560, 0, 40, 20)

        self.pushbutton_stop.clicked.connect(self.clickstop)
        self.pushbutton_stop.setStyleSheet("background-color: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.5, fy:0.5, stop:0.113636 rgba(0, 62, 79, 147), stop:0.306818 rgba(28, 14, 68, 156));background-color: rgb(130, 68, 206);")
        self.pushbutton_stop.move(200,500)
        self.pushbutton_stop.setGeometry(0, 310, 40, 20)

        self.pushbutton_pause.clicked.connect(self.clickpause)
        self.pushbutton_pause.setStyleSheet("background-color: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.5, fy:0.5, stop:0.113636 rgba(0, 62, 79, 147), stop:0.306818 rgba(28, 14, 68, 156));background-color: rgb(130, 68, 206);")
        self.pushbutton_pause.move(200,500)
        self.pushbutton_pause.setGeometry(38, 310, 40, 20)

        self.pushbutton_remove.clicked.connect(self.clickremove)
        self.pushbutton_remove.setStyleSheet("background-color: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.5, fy:0.5, stop:0.113636 rgba(0, 62, 79, 147), stop:0.306818 rgba(28, 14, 68, 156));background-color: rgb(130, 68, 206);")
        self.pushbutton_remove.move(200,500)
        self.pushbutton_remove.setGeometry(0, 310, 40, 20)

        self.btn.clicked.connect(self.update_dir)
        self.btn.setStyleSheet("border:none;background-color: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.5, fy:0.5, stop:0.113636 rgba(0, 62, 79, 147), stop:0.306818 rgba(28, 14, 68, 156));background-color: rgb(130, 68, 206);")
        self.btn.move(200,500)
        self.btn.setGeometry(600, 0, 40, 20)

        self.pushbutton_stop.hide()
        self.pushbutton_remove.hide()
        self.pushbutton_pause.hide()
        self.listWidget.itemClicked.connect(self.onClicked)

    def onClicked(self, item):      #Самая важная часть, при нажатии на элемент списка начинает проигрываться музыка из папки.
        path='2HYI.gif'
        gif = QtGui.QMovie(path)
        self.label.setMovie(gif)
        gif.start()
        try:
            path_file = item.data(QtCore.Qt.UserRole)
            with open(path_file, 'r') as file:
                self.pushbutton_remove.hide()
                self.pushbutton_stop.show()
                self.pushbutton_pause.show()

                pygame.init()
                name = item.text()
                pygame.mixer.music.load(name)
                pygame.mixer.music.play(1)
        except Exception:
            self.pushbutton_stop.hide()
            self.pushbutton_pause.hide()
            self.pushbutton_remove.hide()


    def close(self):
        exit()

    def clickstop(self):            #!!!
        path='2HYI.gif'
        gif = QtGui.QMovie(path)
        self.label.setMovie(gif)
        gif.stop()
        self.label.setPixmap(QtGui.QPixmap("2HYI.gif"))
        try:
            self.pushbutton_stop.hide()
            self.pushbutton_pause.hide()
            self.pushbutton_remove.hide()
            pygame.mixer.music.stop()
            pygame.quit()
        except Exception:
            pass

    def clickpause(self):                   #!!!
        path='2HYI.gif'
        gif = QtGui.QMovie(path)
        self.label.setMovie(gif)
        gif.stop()
        self.label.setPixmap(QtGui.QPixmap("2HYI.gif"))
        try:
            self.pushbutton_pause.hide()
            self.pushbutton_remove.show()

            pygame.mixer.music.pause()
        except Exception:
            pass

    def clickremove(self):                  #!!!
        path='2HYI.gif'
        gif = QtGui.QMovie(path)
        self.label.setMovie(gif)
        gif.start()
        try:
            self.pushbutton_pause.show()
            self.pushbutton_remove.hide()

            pygame.mixer.music.unpause()
        except Exception:
            pass

    def closeEvent(self, event):            #!!!
        try:
            pygame.mixer.music.stop()
            pygame.quit()
        except Exception:
            pass
        finally:
            pygame.quit()




    def update_dir(self):                                               #!!!
        path='2HYI.gif'
        gif = QtGui.QMovie(path)
        self.label.setMovie(gif)
        gif.stop()
        self.label.setPixmap(QtGui.QPixmap("2HYI.gif"))
        try:
            self.pushbutton_pause.hide()
            self.pushbutton_remove.show()

            pygame.mixer.music.pause()
        except Exception:
            pass
        directory = QFileDialog.getExistingDirectory(
            self,
            "QFileDialog.getExistingDirectory()",
            '.'
        )
        if directory:
            _list = [ file for file in os.listdir(f"{directory}") if file.endswith(".mp3") ] #/*.txt")]
            if not _list:
                return
            self.listWidget.clear()
            for i, item in enumerate(_list):
                self.listWidget.addItem(item)
                item_data = os.path.join(directory, item).replace('\\', '/')
                self.listWidget.item(i).setData(QtCore.Qt.UserRole, item_data)

    def mousePressEvent(self, event):
        if event.button() == QtCore.Qt.LeftButton:
            self.old_pos = event.pos()


    def mouseReleaseEvent(self, event):
        if event.button() == QtCore.Qt.LeftButton:
            self.old_pos = None


    def mouseMoveEvent(self, event):
        if not self.old_pos:
            return
        delta = event.pos() - self.old_pos
        self.move(self.pos() + delta)