在放入线程中的函数发信号，在线程外的函数中收信号

from PyQt5.QtCore import pyqtSignal, pyqtSlot, QThread, QObject
import threading

class MyClass(QObject):
    result_out = pyqtSignal(str)

    def __init__(self):
        super().__init__()
        self.flag = 0
        self.result_out.connect(self.handle_signal)

    def function_in_thread(self):
        self.result_out.emit('a')
        print('self.flag in thread =', self.flag, '\n')

    def function_outside_thread(self):
        # 创建一个线程并启动
        t = threading.Thread(target=self.function_in_thread)
        t.start()

        # 在接收到信号之后断开信号和槽的连接
        self.result_out.disconnect(self.handle_signal)
        print('self.flag outside thread =', self.flag, '\n')

    def handle_signal(self, b):
        print('b =', b)
        if b == '1':
            self.flag = '1'
        elif b == '0':
            self.flag = '0'

if __name__ == "__main__":
    obj = MyClass()
    obj.function_outside_thread()