场景：

有两个QLineEdit控件，记录用户选择的目录，当用户在QLineEdit控件上右击时，显示右键菜单->浏览目录，点击“浏览目录”时通过资源管理器打开目录。

import os
import subprocess
import sys

from PyQt5.QtGui import QIcon, QCursor, QPixmap
from PyQt5.QtWidgets import QWidget, QApplication, QMainWindow, QFileDialog, QMenu
from PyQt5.QtCore import Qt

from main_window import Ui_frmMain
from appConfig import Config
import files_rc

def __init__(self):
    super().__init__()
    self.createContextMenu(self.txtOutputImagesDir)
    self.createContextMenu(self.txtOutputVideoDir)

def createContextMenu(self, ctl):
    try:
        ctl.setContextMenuPolicy(Qt.CustomContextMenu)
        ctl.customContextMenuRequested.connect(lambda: self.showContextMenu(ctl))

        # 创建QMenu
        ctl.contextMenu = QMenu(ctl)
        # icon3 = QIcon()
        # icon3.addPixmap(QPixmap(":/16x16/icons/16x16/cil-folder-open.png"), QIcon.Normal, QIcon.Off)
        action = ctl.contextMenu.addAction(QIcon(":/16x16/icons/16x16/cil-folder-open.png"), u'浏览目录')
        action.triggered.connect(lambda: self.action_open_directory_Handler(ctl))

    except Exception as ex:
        print(ex)

def showContextMenu(self, ctl):
    '''''
    右键点击显示控件右键菜单
    '''
    # 菜单定位
    ctl.contextMenu.exec_(QCursor.pos())

def action_open_directory_Handler(self, ctl):
    '''''
    控件右键菜单对应的action
    '''
    dir = ctl.text()
    if len(dir) == 0:
        return
    try:
        os.startfile(dir)
    except Exception as ex:
        subprocess.Popen(['xdg-open', dir])