PyQt5打开文件对话框QFileDialog

python：3.5
PyQt5
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单个文件打开 QFileDialog.getOpenFileName()
多个文件打开 QFileDialog.getOpenFileNames()
文件夹选取 QFileDialog.getExistingDirectory()
文件保存 QFileDialog.getSaveFileName()

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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_())