python - PySide: 'PySide.QtCore.Signal' 对象没有属性 'emit'

Question

使用以下代码，在尝试发出信号时出现错误(“PySide.QtCore.Signal”对象没有属性“emit”):

#!/usr/bin/env python

from PySide import QtCore

class TestSignalClass(QtCore.QObject):
    somesignal = QtCore.Signal()

    def speak_me(self):
        self.speak.emit()
    def __init__(self):
        try:
            self.somesignal.emit()
        except Exception as e:
            print("__init__:")
            print(e)

t = TestSignalClass()

我该怎么做才能解决这个问题？

Answer 1

这里的问题是，虽然该类正确地继承自QtCore.QObject，但它没有调用父类的构造函数。这个版本工作正常:

#!/usr/bin/env python

from PySide import QtCore

class TestSignalClass(QtCore.QObject):
    somesignal = QtCore.Signal()

    def speak_me(self):
        self.speak.emit()
    def __init__(self):
        # Don't forget super(...)!
        super(TestSignalClass, self).__init__()
        try:
            self.somesignal.emit()
        except Exception as e:
            print("__init__:")
            print(e)

t = TestSignalClass()