使用pyqtSignal中出现"AttributeError: 'PyQt5.QtCore.pyqtSignal' object has no attribute 'connect'"

对PyQT的自定义信号还不太熟悉，今天在使用中出现错误

AttributeError: 'PyQt5.QtCore.pyqtSignal' object has no attribute 'connect'

原来是定义的位置出错了
应该是：

>>> class MyForm(QtWidgets.QMainWindow):
>>> 	sig = pyqtSignal()
>>>     def __init__(self, user, password, address, port, databass):
>>>         super().__init__()
>>> 		self.sig.connect(xxxx)

而不应该是：

>>> class MyForm(QtWidgets.QMainWindow):
>>>     def __init__(self, user, password, address, port, databass):
>>>         super().__init__()
>>> 		self.sig = pyqtSignal()
>>> 		self.sig.connect(xxxx)

参考：https://blog.youkuaiyun.com/jeekmary/article/details/79675917