Pyqt5 - 文件对话框 GUI 关闭后无法运行代码

Question

我的代码是用PYQT的OpenFileNamedialog手动选择两个.CSV文件(在单独的文件夹中(，然后继续执行不涉及GUI的代码。我可以获取文件选择窗口以运行并选择文件名，但是代码不再处理。我究竟做错了什么？谢谢

import pandas as pd
import numpy as np
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QFileDialog
class App(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):        
        self.openFileNameDialog()
        self.openFileNameDialog2()
    def openFileNameDialog(self):
        print('Getting file 1 location')
        filepath, _ = QFileDialog.getOpenFileName(self, "Open report 1", "", "csv (*.csv)")
        print('File 1 location: ',filepath)
    def openFileNameDialog2(self):
        print('Getting file 2 location')
        filepath2, _ = QFileDialog.getOpenFileName(self, "Open report 2", "", "csv (*.csv)")
        print('File 2 location: ',filepath2)
    def closeEvent(self):
        super(QWidget,self).closeEvent()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())
### The code doesn't run past this point
file1 = pd.read_csv(filepath, encoding='utf-8')
print(file1[0])
file2 = pd.read_csv(filepath2, encoding='utf-8')
print(file2[0])

Answer 1

例如：

# ...
def openFileNameDialog(self):
    print('Getting file 1 location')
    filepath, _ = QFileDialog.getOpenFileName(self, "Open report 1", "", "csv (*.csv)")
    print('File 1 location: ',filepath)
    # read file1
    file1 = pd.read_csv(filepath, encoding='utf-8')
    print(file1[0])
def openFileNameDialog2(self):
    print('Getting file 2 location')
    filepath2, _ = QFileDialog.getOpenFileName(self, "Open report 2", "", "csv (*.csv)")
    print('File 2 location: ',filepath2)
    # read file2
    file2 = pd.read_csv(filepath2, encoding='utf-8')
    print(file2[0])
# ...