PyQt5每天必学之滑块控件QSlider_python

#!/usr/bin/python3
# -*- coding: utf-8 -*-

"""
PyQt5 教程

这个例子显示了一个QSlider控件的使用方法。

作者：我的世界你曾经来过
博客：http://blog.csdn.net/weiaitaowang
最后编辑：2016年8月3日
"""

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QSlider
from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt

class Example(QWidget):

 def __init__(self):
  super().__init__()

  self.initUI()

 def initUI(self):

  sld = QSlider(Qt.Horizontal, self)
  sld.setFocusPolicy(Qt.NoFocus)
  sld.setGeometry(30, 40, 100, 30)
  sld.valueChanged[int].connect(self.changeValue)

  self.label = QLabel(self)
  self.label.setPixmap(QPixmap('F:\Python\PyQt5\Widgets\images\mute.png'))
  self.label.setGeometry(160, 30, 80, 50)

  self.setGeometry(300, 300, 280, 170)
  self.setWindowTitle('滑块控件')  
  self.show()

 def changeValue(self, value):

  if value == 0:
   self.label.setPixmap(QPixmap('F:\Python\PyQt5\Widgets\images\mute.png'))
  elif value > 0 and value <= 30:
   self.label.setPixmap(QPixmap(&#39;F:\Python\PyQt5\Widgets\images\min.png&#39;))
  elif value > 30 and value < 80:
   self.label.setPixmap(QPixmap(&#39;F:\Python\PyQt5\Widgets\images\med.png&#39;))
  else:
   self.label.setPixmap(QPixmap(&#39;F:\Python\PyQt5\Widgets\images\max.png&#39;))

if __name__ == &#39;__main__&#39;:

 app = QApplication(sys.argv)
 ex = Example()
 sys.exit(app.exec_())

sld = QSlider(Qt.Horizontal, self)

self.label = QLabel(self)
self.label.setPixmap(QPixmap('F:\Python\PyQt5\Widgets\images\mute.png'))

sld.valueChanged[int].connect(self.changeValue)

if value == 0:
 self.label.setPixmap(QPixmap('F:\Python\PyQt5\Widgets\images\mute.png'))