2019-08-16day20总结 2019-08-16day20总结

from threading import Thread
总结: 数据的存储跟线程无关; 一个进程中的数据在多个线程中可以直接用

情况一: 在子线程中使用主线程中的数据 list1 = [1, 2, 3]def func1(): list1.append(100)def func2(): list1[0] = 'hello't1 = Thread(target=func1) t2 = Thread(target=func2) t1.start() t2.start()t1.join() t2.join() print(list1)# ['hello', 2, 3, 100]

情况2: 在子线程中使用子线程中产生的数据 def func1(): global list1 list1 = [1, 2, 3]def func2(): t = Thread(target=func1) t.start() print(list1)t1 = Thread(target=func2) t1.start()

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数据共享安全问题

from time import sleep from threading import Thread, Lock""" 获取锁对象获取数据数操作完成后释放锁对象注意: 使用锁的时候保证一个数据对应一把锁 """class Account: """银行账号类""" def __init__(self, name, tel, balance, bank='招商银行'): self.bank = bank self.card_number = '6233392838382383' self.name = name self.tel = tel self.balance = balance self.lock = Lock()# 1.创建锁(保证一个数据一把锁)def save_money(self, amount): print('=====开始存钱！======') # 2.使用锁 self.lock.acquire() # 获取余额 bl = self.balance # print('存钱余额1:',bl) sleep(2) self.balance = bl + amount # 3.释放锁 self.lock.release() # print('存钱余额2:', self.balance) print('=====存钱结束!======')def draw_money(self, amount): print('=====开始取钱！======') self.lock.acquire() bl = self.balance # print('取钱余额1:', bl) if bl < amount: print('余额不足!') print('=====取钱结束======') return sleep(3) self.balance = bl - amount self.lock.release() # print('取钱余额2:', self.balance) print('=====取钱结束======')account = Account('余婷', '153000782', 10000)t1 = Thread(target=account.save_money, args=(20000,)) t2 = Thread(target=account.draw_money, args=(5000,)) t1.start() t2.start() t1.join() t2.join() print(account.balance)account2 = Account('小明', '23782738738', 1000)

【2019-08-16day20总结】锁的使用

from threading import * from time import sleeplist1 = [1, 2, 3] lock = Lock()def func1(): lock.acquire() global list1 list2 = list1[:] sleep(3) list2.append(100) list1 = list2[:] lock.release()def func2(): lock.acquire() global list1 list2 = list1[:] sleep(3) list2.remove(2) list1 = list2[:] lock.release()t1 = Thread(target=func1) t2 = Thread(target=func2) t1.start() t2.start() t1.join() t2.join() print(list1)