python之multiprocessing.Process()的用法

# -*- coding: utf-8 -*-
'''
multiprocessing.Process()例程
'''

from PyQt5.QtWidgets import QWidget, QPushButton, QMessageBox, QApplication
import numpy as np
import matplotlib.pyplot as plt
import time
from tqdm import tqdm
from progressbar import *
import multiprocessing


def dra_w():
    x = np.random.randint(10, size=10)
    print(x)
    y = np.random.randint(10, size=10)
    plt.figure('第一个进程')
    # 防止标题中文乱码
    plt.rcParams['font.sans-serif'] = ['SimHei']
    plt.rcParams['axes.unicode_minus'] = False
    plt.title('例子')
    plt.scatter(x, y, alpha=0.5, c='b')
    # 将每个点的坐标值显示出来
    for x, y in zip(x, y):
        plt.annotate('(%s, %s)' % (x, y), 
                    xy=(x, y), 
                    xytext=(0, -5), 
                    textcoords='offset points', 
                    ha='center', va='top')
    plt.show()


class pyq_t(QWidget):
    def __init__(self):
        super(pyq_t, self).__init__()
        self.InitUi()

    def InitUi(self):
        self.resize(600, 400)
        self.setWindowTitle('第二个进程')
        self.button_1 = QPushButton('Exit', self)
        self.button_1.setGeometry(60, 120, 200, 120)
        self.button_1.clicked.connect(self.exi_t)
        self.show()

    def exi_t(self):
        self.close()

    def closeEvent(self, event):
        reply = QMessageBox.question(self, 'sure', 'Are you sure you want to quit?', QMessageBox.Yes | QMessageBox.Cancel)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()


def mai_n():
    app = QApplication(sys.argv)
    myw = pyq_t()
    # myw.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    process1 = multiprocessing.Process(target=dra_w)
    process1.start()
    # time.sleep(5)
    for i in tqdm(range(0, 1000)):
        time.sleep(0.01)
    mai_n()

我曾经跨过山和大海，也穿过人山人海，我曾经拥有着的一切，转眼都飘散如烟，我曾经失落失望失掉所有方向，直到看见平凡才是唯一的答案。
——韩寒《平凡之路》