"""多进程和多线程"""
# 顺序执行
# from random import randint
# from time import time, sleep
#
#
# def download_task(filename):
# print('开始下载%s...' % filename)
# time_to_download = randint(5, 10)
# sleep(time_to_download)
# print('%s下载完成! 耗费了%d秒' % (filename, time_to_download))
#
#
# def main():
# start = time()
# download_task('Python从入门到住院.pdf')
# download_task('Peking Hot.avi')
# end = time()
# print('总共耗费了%.2f秒.' % (end - start))
#
# # 开始下载Python从入门到住院.pdf...
# # Python从入门到住院.pdf下载完成! 耗费了10秒
# # 开始下载Peking Hot.avi...
# # Peking Hot.avi下载完成! 耗费了9秒
# # 总共耗费了19.02秒.
# if __name__ == '__main__':
# main()
# 并行执行
# from multiprocessing import Process
# from os import getpid
# from random import randint
# from time import time, sleep
#
#
# def download_task(filename):
# print('启动下载进程，进程号[%d].' % getpid())
# print('开始下载%s...' % filename)
# time_to_download = randint(5, 10)
# sleep(time_to_download)
# print('%s下载完成! 耗费了%d秒' % (filename, time_to_download))
#
# # #启动下载进程，进程号[9080].
# # 开始下载Peking Hot.avi...
# # 启动下载进程，进程号[12668].
# # 开始下载Python从入门到住院.pdf...
# # Python从入门到住院.pdf下载完成! 耗费了6秒
# # Peking Hot.avi下载完成! 耗费了8秒
# # 总共耗费了8.40秒.
# def main():
# start = time()
# p1 = Process(target=download_task, args=('Python从入门到住院.pdf', ))
# p1.start()
# p2 = Process(target=download_task, args=('Peking Hot.avi', ))
# p2.start()
# p1.join()
# p2.join()
# end = time()
# print('总共耗费了%.2f秒.' % (end - start))
#
#
# if __name__ == '__main__':
# main()
# 用多线程
# from random import randint
# from threading import Thread
# from time import time, sleep
#
#
# def download(filename):
# print('开始下载%s...' % filename)
# time_to_download = randint(5, 10)
# sleep(time_to_download)
# print('%s下载完成! 耗费了%d秒' % (filename, time_to_download))
#
#
# def main():
# start = time()
# t1 = Thread(target=download, args=('Python从入门到住院.pdf',))
# t1.start()
# t2 = Thread(target=download, args=('Peking Hot.avi',))
# t2.start()
# t1.join()
# t2.join()
# end = time()
# print('总共耗费了%.3f秒' % (end - start))
# # 开始下载Python从入门到住院.pdf...
# # 开始下载Peking Hot.avi...
# # Peking Hot.avi下载完成! 耗费了5秒
# # Python从入门到住院.pdf下载完成! 耗费了9秒
# # 总共耗费了9.008秒
#
# if __name__ == '__main__':
# main()
# 自定义多线程
from random import randint
from threading import Thread
from time import time, sleep
# class DownloadTask(Thread):
#
# def __init__(self, filename):
# super().__init__()
# self._filename = filename
#
# def run(self):
# print('开始下载%s...' % self._filename)
# time_to_download = randint(5, 10)
# sleep(time_to_download)
# print('%s下载完成! 耗费了%d秒' % (self._filename, time_to_download))
#
#
# def main():
# start = time()
# t1 = DownloadTask('Python从入门到住院.pdf')
# t1.start()
# t2 = DownloadTask('Peking Hot.avi')
# t2.start()
# t1.join()
# t2.join()
# end = time()
# print('总共耗费了%.2f秒.' % (end - start))
#
# # 开始下载Python从入门到住院.pdf...
# # 开始下载Peking Hot.avi...
# # Peking Hot.avi下载完成! 耗费了5秒
# # Python从入门到住院.pdf下载完成! 耗费了10秒
# # 总共耗费了10.01秒.
# if __name__ == '__main__':
# main()
from time import sleep
from threading import Thread,Lock
class Account(object):
def __init__(self):
self.lock = Lock()
self._balance = 0
def deposit(self, money):
self.lock.acquire()
try:
# 计算存款后的余额
new_balance = self._balance + money
# 模拟受理存款业务需要0.01秒的时间
sleep(0.01)
# 修改账户余额
self._balance = new_balance
# self.lock.release()
finally:
self.lock.release()
@property
def balance(self):
return self._balance
class AddMoneyThread(Thread):
def __init__(self, account, money):
super().__init__()
self._account = account
self._money = money
def run(self):
self._account.deposit(self._money)
def main():
account = Account()
threads = []
# 创建100个存款的线程向同一个账户中存钱
for _ in range(100):
t = AddMoneyThread(account, 1)
threads.append(t)
t.start()
# 等所有存款的线程都执行完毕
for t in threads:
t.join()
print('账户余额为: ￥%d元' % account.balance)
if __name__ == '__main__':
main()
