PyQt5開啟檔案對話方塊QFileDialog

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python：3.5
PyQt5
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單個檔案開啟 QFileDialog.getOpenFileName()
多個檔案開啟 QFileDialog.getOpenFileNames()
資料夾選取 QFileDialog.getExistingDirectory()
檔案儲存 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,
                                    "選取資料夾",
                                    "./")                                 #起始路徑
        print(directory1)

        fileName1, filetype = QFileDialog.getOpenFileName(self,
                                    "選取檔案",
                                    "./",
                                    "All Files (*);;Text Files (*.txt)")   #設定副檔名過濾,注意用雙分號間隔
        print(fileName1,filetype)

        files, ok1 = QFileDialog.getOpenFileNames(self,
                                    "多檔案選擇",
                                    "./",
                                    "All Files (*);;Text Files (*.txt)")
        print(files,ok1)

        fileName2, ok2 = QFileDialog.getSaveFileName(self,
                                    "檔案儲存",
                                    "./",
                                    "All Files (*);;Text Files (*.txt)")

if __name__=="__main__":  
    import sys  
  
    app=QtWidgets.QApplication(sys.argv)  
    myshow=MyWindow()
    myshow.show()
    sys.exit(app.exec_())