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pyqt5 的 QPlainTextEdit光标如何移动到指定行？

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pyqt5 的 QPlainTextEdit光标如何移动到指定行？

pyqt5 的 QPlainTextEdit光标如何移动到指定行，网上只查到
self.textEdit_Recive.moveCursor(QTextCursor.End)这种移到首尾，没有指定数字的，
我用
self.aPlainTextEdit.moveCursor(3,QtGui.QTextCursor.MoveAnchor)，没有提示错误，也没有看到效果


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