QTreeWidget 获取被双击的子项的层次路径

from PyQt5.QtWidgets import (QApplication, QWidget, QHBoxLayout,
                                QTreeWidget, QTreeWidgetItem,
                                QGroupBox)
from PyQt5.QtGui import QIcon, QPixmap
from PyQt5.QtCore import QSize

class  Bar_Navigation(QWidget):
        def  __init__(self):
            super(Bar_Navigation, self).__init__()
            self.setMinimumHeight(600);
            self.setMinimumWidth(800);
            
            ##layout_main.setMargin(5)
            ##layout_main.setSpace(5)
            self.creat_main_layout()
            self.creat_bar_navigation()
            self.creat_left_box()
         
        def get_bar_list(self):
           
            bar_list_item = []
            bar_list_1 = ["订货管理", 
                                            ["客户订货", "库存订货", "供货商订货"]
                                    ]
            bar_list_2 = ["入库管理", 
                                            ["采购入库", "订货入库", "其它入库"]
                                    ]
            bar_list_item.append(bar_list_1)
            bar_list_item.append(bar_list_2)
            return  bar_list_item
            
        def creat_main_layout(self):  
            self.layout_main = QHBoxLayout()
            self.setLayout( self.layout_main)
         
        def creat_bar_list(self, data):
            
            for item in data:
                item_1 =  QTreeWidgetItem( self.tree_Navigation);            
                ##item_1.setText(0,item[0])
                
　　　　　　　　　 ## 设置节点的打开/关闭状态下的不同的图片
                icon = QIcon()
                ##节点打开状态 
                icon.addPixmap(QPixmap("./logo2.png"), QIcon.Normal, QIcon.On)
                ##节点关闭状态　　 
                icon.addPixmap(QPixmap("./logo1.png"), QIcon.Normal, QIcon.Off)
                item_1.setIcon(0, icon)
                
                for item_item in item[1]:
                    item_1_1 =  QTreeWidgetItem( item_1);            
                    item_1_1.setText(0,item_item)   
                self.tree_Navigation.addTopLevelItem(item_1);
            
           
            
       
       
        def creat_bar_navigation(self):
            self.tree_Navigation = QTreeWidget()     
            self.tree_Navigation.setHeaderLabel("左侧导航栏");            
            self.tree_Navigation.setColumnCount(1)
            self.tree_Navigation.setMaximumWidth(150);
            
            icon_size = QSize(100, 30)
            self.tree_Navigation.setIconSize(icon_size)
            
            ##如果treewidget就一列，该列的宽度默认等于treewidget的宽度,两列以上的话才起作用.
            ##self.tree_Navigation.setColumnWidth(0,100);
            data = self.get_bar_list()
            self.creat_bar_list(data)
            self.layout_main.addWidget(self.tree_Navigation)
            ## QModelIndex
            ##self.tree_Navigation.doubleClicked.connect(self.showModelSelected)
            ## QTreeWidgetItem
            self.tree_Navigation.itemDoubleClicked.connect(self.showSelected)
        
        ## QModelIndex
        def showModelSelected(self, modelIndex):
             print( modelIndex.row(), modelIndex.column())
             
        ## itemObj:QTreeWidgetItem
        def showSelected(self, item, column):
            ##获得父节点 
            parent=item.parent()    
            
            ## 注:本例的深度只有2,因此只有index_top,index_row两个变量表示路径
            ##根节点上的索引
            ## 合理值:非负整数
            index_top = 0
            ## 子节点上的索引
            ##如果为-1则标示是根节点上的项;如果不是-1则标示在子节点上
            ## 合理值:非负整数
            index_row = -1
            
            ## 如果是要判断是否为None，则：
            if parent is None:
                index_top= self.tree_Navigation.indexOfTopLevelItem(item)
            else :                
                index_top =  self.tree_Navigation.indexOfTopLevelItem(parent)  
                index_row=parent.indexOfChild(item)##获得节点在父节点中的行号(从0开始)
                
            print(index_top,  index_row)
            
        def creat_left_box(self):
            self.box_left = QGroupBox('left party')   
            self.layout_main.addWidget(self.box_left)

if __name__ == "__main__":

    import sys

    app = QApplication(sys.argv)
    window = Bar_Navigation()
    window.show()

    sys.exit(app.exec_())

个人注解：   

①、treeWidget.setColumnWidth(0,100)

如果treewidget就一列，该列的宽度默认等于treewidget的宽度,两列以上的话才起作用,

②、如果是treeview获取点击的层级路径：

　　modelindex.parent()可以获得其上级。