pyqt QListWidget总结

设置允许多选  setSelectionMode(QAbstractItemView.ExtendedSelection)

添加一项  addItem(item)

添加多项  addItems(item)

获取项数  count()

获取选定项 selectedItems()，注意返回的是QListWidgetItem不是list，所以还需要额外操作

items = self.listwidgetToSelect.selectedItems()
nodes = [i.text() for i in list(items)]

获取全部内容 

nitem = self.listwidgetSelected.count()
nodes = []
for i in range(nitem):
    nodes.append(self.listwidgetSelected.item(i).text())

References

1. Drag and Drop between QListWidget
2. https://bbs.youkuaiyun.com/topics/390978610
3. https://www.cnblogs.com/ygzhaof/p/10077192.html