对话框——文件对话框

QFileDialog是一个允许用户选择文件或目录的对话框。可用以选择打开或保存文件
示例图如下：
 1 #!/usr/bin/python3
 2 # -*- coding: utf-8 -*-
 3 
 4 """
 5 ZetCode PyQt5 tutorial
 6 
 7 In this example, we select a file with a
 8 QFileDialog and display its contents
 9 in a QTextEdit.
10 
11 Author: Jan Bodnar
12 Website: zetcode.com
13 Last edited: August 2017
14 """
15 
16 from PyQt5.QtWidgets import (QMainWindow, QTextEdit,
17     QAction, QFileDialog, QApplication)
18 from PyQt5.QtGui import QIcon
19 import sys
20 
21 
22 class Example(QMainWindow):
23 
24     def __init__(self):
25         super().__init__()
26 
27         self.initUI()
28 
29     def initUI(self):
30 
31         self.textEdit = QTextEdit()
32         # 把self.textEdit设置为主窗口的中心窗口部件
33         self.setCentralWidget(self.textEdit)
34         self.statusBar()
35 
36         openFile = QAction(QIcon('open.png'), 'Open', self)
37         openFile.setShortcut('Ctrl+O')
38         openFile.setStatusTip('Open new File')
39         openFile.triggered.connect(self.showDialog)
40 
41         menubar = self.menuBar()
42         fileMenu = menubar.addMenu('&File')
43         fileMenu.addAction(openFile)
44 
45         self.setGeometry(300, 300, 350, 300)
46         self.setWindowTitle('File dialog')
47         self.show()
48 
49     def showDialog(self):
50         
51         # 弹出文件对话框
52         # The first string in the getOpenFileName() method is the caption
53         # The second string specifies the dialog working directory
54         fname = QFileDialog.getOpenFileName(self, 'Open file', '/home')
55 
56         if fname[0]:
57             f = open(fname[0], 'r')
58             print(f)
59 
60             with f:
61                 data = f.read()
62                 print(data)
63                 self.textEdit.setText(data)
64 
65 
66 if __name__ == '__main__':
67 
68     app = QApplication(sys.argv)
69     ex = Example()
70     sys.exit(app.exec_())