How to emit signal from one class and connect it to SLOT in a different class.

emitSignal_2.py

from PyQt4.QtCore import pyqtSignal, pyqtSlot
from PyQt4.QtGui import QWidget, QApplication
import sys    

class SomeClass(QWidget):
    # Declare a new signal - passes Exception
    has_error = pyqtSignal(Exception)

    def __init__(self, parent=None):
        super(SomeClass, self).__init__(parent)

    def run_something(self):
        #Force an Error
        try:
            1 / 0
        except ZeroDivisionError as ze:
            #Emit the Signal
            self.has_error.emit(ze)


class SomeOtherClass(QWidget):
    def __init__(self, parent=None):
        super(SomeOtherClass, self).__init__(parent)

        # Initialise the Class and connect signal to slot
        class1 = SomeClass()
        class1.has_error.connect(self.thrown_error)
        class1.run_something()

    @pyqtSlot(Exception)
    def thrown_error(self, my_err):
        #Do Stuff with the Exception
        print(type(my_err), my_err)


app = QApplication(sys.argv)
SomeOtherClass()