PyQt5关于QThread的小demo看完就会

# -*- coding: utf-8 -*-
'''
PyQt5关于QThread的使用小demo
'''
import sys
import time
import numpy as np
import matplotlib.pyplot as plt
from PyQt5.QtCore import QThread, pyqtSignal
from module import csialgorithm as ag
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QMessageBox, \
    QPushButton, QLineEdit, QLabel, QToolTip, QComboBox, QTextEdit
from PyQt5.QtCore import QThread, pyqtSignal


class Demo(QMainWindow):
    def __init__(self):
        super(Demo, self).__init__()
        self.init_ui()

    def init_ui(self):
        self.resize(500, 500)
        self.setWindowTitle('Demo')
        self.setFixedSize(self.width(), self.height())
        self.textEdit = QTextEdit(self)
        self.textEdit.setGeometry(20, 20, 460, 250)
        self.btn_start = QPushButton('start', self)
        self.btn_start.setGeometry(200, 350, 100, 50)
        self.btn_start.clicked.connect(self.slot_btn_start)

    def slot_btn_start(self):
        self.thread_1 = ThreadDemo()
        self.thread_1.trigger.connect(self.print_in_textEdit)
        self.thread_1.start()

    def print_in_textEdit(self, msg):
        self.textEdit.append(msg)
        self.thread_1.exit()


class ThreadDemo(QThread):
    trigger = pyqtSignal(str)

    def __init__(self):
        super(ThreadDemo, self).__init__()

    def run(self):
        for i in range(10):
            # print(i)
            self.trigger.emit(str(i))
            time.sleep(1)


def _main():
    app = QApplication(sys.argv)
    w = Demo()
    w.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    _main()