QFileDialog怎么导入

要使用QFileDialog，需要先导入QtCore和QtWidgets模块。可以使用以下代码来导入QFileDialog：

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

在导入完模块后，就可以使用QFileDialog的各种方法来打开保存文件或打开文件对话框了。例如使用`QFileDialog.getOpenFileName()`方法来获取一个打开文件的文件名，或者使用`QFileDialog.getExistingDirectory()`方法获取打开文件夹的文件名。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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