Python 如何从QSlider中获取值

在这段代码中，我想用PyQt5创建QSlider的GUI。我只想在移动滑块时打印更改的值。但在这里，它只打印90，这是滑块的主要值

注：我知道可以通过valuechange功能打印不断变化的值。但是我只需要打印init函数中的值

守则：

---

如果您确实愿意，您可以：-

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QApplication, QCheckBox, QGridLayout,
                             QGroupBox,QMenu, QPushButton,
                             QRadioButton, QVBoxLayout,
                             QWidget, QSlider,QLabel)

class sliderdemo(QWidget):
    def __init__(self, vSl=90, parent=None):
        super(sliderdemo, self).__init__(parent)
        layout = QVBoxLayout()
        self.sl = QSlider(Qt.Horizontal)
        self.sl.setMinimum(0)
        self.sl.setMaximum(180)
        self.sl.setValue(vSl)
        self.sl.setTickPosition(QSlider.TicksBelow)
        self.sl.setTickInterval(10)

        layout.addWidget(self.sl)
        self.sl.valueChanged[int].connect(self.valuechange)
        self.setLayout(layout)
        self.setWindowTitle("slider")
        #print(self.valuechange())
        print("__init__vSl -> ", vSl)

    def valuechange(self, value):
        #self.size = self.sl.value()
        self.__init__(value)
        #return self.size

def main():
   app = QApplication(sys.argv)
   ex = sliderdemo(90)
   ex.show()
   sys.exit(app.exec_())

if __name__ == '__main__':
   main()

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QApplication, QCheckBox, QGridLayout,
                             QGroupBox,QMenu, QPushButton,
                             QRadioButton, QVBoxLayout,
                             QWidget, QSlider,QLabel)

class sliderdemo(QWidget):
    def __init__(self, vSl=90, parent=None):
        super(sliderdemo, self).__init__(parent)
        layout = QVBoxLayout()
        self.sl = QSlider(Qt.Horizontal)
        self.sl.setMinimum(0)
        self.sl.setMaximum(180)
        self.sl.setValue(vSl)
        self.sl.setTickPosition(QSlider.TicksBelow)
        self.sl.setTickInterval(10)

        layout.addWidget(self.sl)
        self.sl.valueChanged[int].connect(self.valuechange)
        self.setLayout(layout)
        self.setWindowTitle("slider")
        #print(self.valuechange())
        print("__init__vSl -> ", vSl)

    def valuechange(self, value):
        #self.size = self.sl.value()
        self.__init__(value)
        #return self.size

def main():
   app = QApplication(sys.argv)
   ex = sliderdemo(90)
   ex.show()
   sys.exit(app.exec_())

if __name__ == '__main__':
   main()