美しいミズキ

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from PySide6.QtWidgets import QFileDialog
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# 打开文件夹选择对话框
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folder = QFileDialog.getExistingDirectory(
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    parent=None,
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    caption="Title",
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    dir=""          # 起始路径
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)
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""" 选择了返回文件夹路径, 取消返回"" """

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from PySide6.QtWidgets import QFileDialog
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file = QFileDialog.getOpenFileName(
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    parent=None,
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    caption="",
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    dir="",
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    filter="(*.*);;文本文件 (*.txt);;图片 (*.png *.jpg)"      # 过滤器
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)[0]

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from PySide6.QtWidgets import QFileDialog
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files = QFileDialog.getOpenFileNames(
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    parent=None,
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    caption="",
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    dir="",
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    filter="(*.*);;文本文件 (*.txt);;图片 (*.png *.jpg)"
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)[0]

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from PySide6.QtWidgets import QFileDialog
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path = QFileDialog.getSaveFileName(
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    parent=None,
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    caption="",
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    dir="",
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    filter="文本文件 (*.txt)"
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)[0]