PyQt4--发送带参数的自定义信号

http://www.saltycrane.com/blog/2008/01/pyqt-how-to-pass-arguments-while/

import sys
import time
from PyQt4.QtCore import *
from PyQt4.QtGui import *
####################################################################
class MyWindow(QWidget):
    def __init__(self, *args):
        QWidget.__init__(self, *args)
        self.label = QLabel(" ")
        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)
        self.connect(self, SIGNAL("didSomething"),
                     self.update_label)
        self.do_something()
    def do_something(self):
        self.emit(SIGNAL("didSomething"), "important", "information")
    def update_label(self, value1, value2):
        self.label.setText(value1 + " " + value2)
####################################################################
if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = MyWindow()
    w.show()
    sys.exit(app.exec_())
可以改成如下形式，运行结构一样
import sys
import time
from PyQt4.QtCore import *
from PyQt4.QtGui import *
####################################################################
class MyWindow(QWidget):
    def __init__(self, *args):
        QWidget.__init__(self, *args)
        self.label = QLabel(" ")
        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)
        self.connect(self, SIGNAL("didSomething"),
                     self.update_label)
        self.do_something()
    def do_something(self):
        self.emit(SIGNAL("didSomething"), "important","information")
    def update_label(self, *args):
        label_str=''
        for argv in args:
            label_str+=' '+argv
        self.label.setText(label_str)
####################################################################
if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = MyWindow()
    w.show()
    sys.exit(app.exec_())