关于 pyqt5 的多线程问题

代码如下
# coding: utf-8
import sys

from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QWidget, QApplication


class Worker(QThread):
    finish_signal = pyqtSignal(str)
    def __init__(self):
        super(Worker, self).__init__()
        self.id = 0
        self.li = []

    def receive_ele(self, ele):
        id, other = [int(i) for i in ele.split('_')]
        if id != self.id:
            return
        self.li.append(other)

    def run(self):
        while 1:
            if not self.li:
                continue
            li, self.li = self.li, []
            ele = 0
            for ele in li:
                pass
            self.finish_signal.emit("{}_{}".format(self.id, ele))
            # QThread.sleep(1)

class Example(QWidget):
    id_signal = pyqtSignal(str)
    def __init__(self, parent=None):
        super(Example, self).__init__(parent=parent)
        # self.initUI()
        self.data = [ i for i in range(1000)]
        self.signals = [0]
        self.initUI()
    def initUI(self):
        # Worker.finish_signal.connect(self.receive_finish)
        for i in range(10):
            t = Worker()
            t.id = i+1
            t.finish_signal.connect(self.receive_finish)
            # self.signals.append(pyqtSignal(str))
            self.id_signal.connect(t.receive_ele)

            t.start()
            ele = self.data.pop(0)
            self.id_signal.emit("{}_{}".format(t.id, ele))

        self.setGeometry(300, 300, 500, 500)
        self.setWindowTitle("signal test")
        print("show")
        self.show()

    def receive_finish(self, str):
        id, num = str.split('_')
        id, num = int(id), int(num)
        if self.data:
            ele = self.data.pop(0)
        else:
            ele = 0
        print("thread:{}, finish num:{}, prepare:{}".format(id, num, ele))
        if ele != 0:
            self.id_signal.emit("{}_{}".format(id, ele))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())
开 10 个子线程，脚本启动不了，只能开一个子线程，这是为什么呀，我想要开 10 个或者 100 个子线城应该怎么办？