from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QFileDialog
 
class MyWindow(QtWidgets.QWidget):
  def __init__(self):
    super(MyWindow,self).__init__()
    self.myButton = QtWidgets.QPushButton(self)
    self.myButton.setObjectName("myButton")
    self.myButton.setText("Test")
    self.myButton.clicked.connect(self.msg)
 
  def msg(self):
    directory1 = QFileDialog.getExistingDirectory(self,
                  "选取文件夹",
                  "./")                 #起始路径
    print(directory1)
 
    fileName1, filetype = QFileDialog.getOpenFileName(self,
                  "选取文件",
                  "./",
                  "All Files (*);;Text Files (*.txt)")  #设置文件扩展名过滤,注意用双分号间隔
    print(fileName1,filetype)
 
    files, ok1 = QFileDialog.getOpenFileNames(self,
                  "多文件选择",
                  "./",
                  "All Files (*);;Text Files (*.txt)")
    print(files,ok1)
 
    fileName2, ok2 = QFileDialog.getSaveFileName(self,
                  "文件保存",
                  "./",
                  "All Files (*);;Text Files (*.txt)")
 
if __name__=="__main__":
  import sys
 
  app=QtWidgets.QApplication(sys.argv)
  myshow=MyWindow()
  myshow.show()
  sys.exit(app.exec_())