小编moD*_*ong的帖子

还在学习pyqt如何工作.我想动态生成customContextMenu并与函数连接.到目前为止,我得到以下,但连接部分不工作？

import sys
from PyQt4 import QtGui, QtCore

class MainForm(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainForm, self).__init__(parent)

    # create button
    self.button = QtGui.QPushButton("test button", self)       
    self.button.resize(100, 30)

    # set button context menu policy
    self.button.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
    self.connect(self.button, QtCore.SIGNAL('customContextMenuRequested(const QPoint&)'), self.on_context_menu)
    self.popMenu = QtGui.QMenu(self)

    def on_context_menu(self, point):
        self.popMenu.clear()

        #some test list for test
        testItems = ['itemA', 'itemB', 'itemC']
        for item in testItems:
            action = self.btn_selectPyFilterPopMenu.addAction("Selected %s" % item)
            self.connect(action,QtCore.SIGNAL("triggered()"),self,QtCore.SLOT("printItem('%s')" % item))    
        self.popMenu.exec_(self.button.mapToGlobal(point))

    @pyqtSlot(str)
    def printItem(self, item):
        print item

def main():
    app = QtGui.QApplication(sys.argv)
    form = …

想要学习使用文件夹导入模块的正确方法

/garden
    __init__.py
    utilities.py
    someTools.py
    /plants
        __init__.py
        carrot.py
        corn.py

里面/plants/__init__.py我有

__all__ = ['carrot', 'corn']
from . import *

内 carrot.py

def info():
    print "I'm in carrot.py"

当我做

import garden
garden.carrot.info()
# got correct result
I'm in carrot.py

我的问题是如何纠正命名空间utilities.py,例如内部carrot.py和corn.py.我想用函数utilities.py

carrot.py我内心的时候

import utilities as util

# try use it and got global name error
util.someFunc()
# NameError: global name 'util' is not defined # 

我可以__init__.py在plants文件夹中配置它以便导入花园内的所有模块吗？像公用事业和一些工具？所以我不必在carrot.py和corn.py中导入实用程序并且能够使用实用程序？

如何删除 的背景颜色QTreeWidgetItem或将其重置为默认值？

treeWidgetItem.setBackgroundColor(0, QtGui.QColor('green'))