python如何通过pyqt5实现进度条

self.pbar = QProgressBar(self) //进度条的定义self.pbar.setGeometry(30, 60, 100, 30) //进度条的大小和位置，前两个是位置，后两个是大小

self.step = 0

self.step = self.step+1self.pbar.setValue(self.step)

#!/usr/bin/python3# -*- coding: utf-8 -*-
"""PyQt5 教程这个例子显示了一个进度条控件。"""import sysfrom PyQt5.QtWidgets import QApplication, QWidget, QProgressBar, QPushButtonfrom PyQt5.QtCore import QBasicTimer
class Example(QWidget):
  def __init__(self):    super().__init__()
    self.initUI()
  def initUI(self):
    self.pbar = QProgressBar(self)    self.pbar.setGeometry(30, 40, 200, 25)
    self.btn = QPushButton('开始', self)    self.btn.move(40, 80)    self.btn.clicked.connect(self.doAction)
    self.timer = QBasicTimer()    self.step = 0    self.setGeometry(300, 300, 280, 170)    self.setWindowTitle('进度条')    self.show()
  def timerEvent(self, e):
    if self.step >= 100:      self.step = 0      self.pbar.setValue(self.step)      self.timer.stop()      self.btn.setText('完成')      return    self.step = self.step+1    self.pbar.setValue(self.step)
  def doAction(self, value):    print("do action")    if self.timer.isActive():      self.timer.stop()      self.btn.setText('开始')    else:      self.timer.start(100, self)      self.btn.setText('停止')
if __name__ == '__main__':   app = QApplication(sys.argv)   ex = Example()   sys.exit(app.exec_())

self.pbar = QProcessBar(self)self.pbar.setMaximum(100)