滑块数字的使用

代码：

#coding: utf-8
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *


class sigsort(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        self.setWindowTitle(self.tr("num"))
        lcd = QLCDNumber(self)
        slider = QSlider(Qt.Horizontal, self)

        vbox = QVBoxLayout()
        vbox.addWidget(lcd)
        vbox.addWidget(slider)

        self.setLayout(vbox)
        self.connect(slider, SIGNAL('valueChanged(int)'), lcd, SLOT('display(int)'))
        self.resize(250, 150)
app = QApplication(sys.argv)
qb = sigsort()
qb.show()
sys.exit(app.exec_())