Python线程之如何解决共享变量问题

import random
import threading
import datetime
import time

xuewei = {'balance': 157}


# amount为负数即是转出金额
def transfer(money):
    name = threading.current_thread().getName()
    print("%s 给xuewei转账 %s " % (name, money))
    xuewei['balance'] += money
    print("xuewei账户余额：", xuewei['balance'])


lists = [-7, 20, -20, 7]  # 4次转账的数额，负数为学委的账户转出，正数为他人转入。
# 创建4个任务给学委转账上面lists的金额
threads = []
for i in range(4):
    amount = lists[i]
    name = "t-" + str(i)
    print("%s 计划转账 %s" % (name, amount))
    mythread = threading.Thread(name=name, target=lambda: transfer(amount))
    threads.append(mythread)

# 开始转账
for t in threads:
    t.start()

# 等待3秒让上面的转账任务都完成，我们在看看账户余额
time.sleep(3)
print("-" * 16)
print("学委账户余额：", xuewei['balance'])

import random
import threading
import datetime
import time

xuewei = {'balance': 157}

lists = [-7, 20, -20, 7]  # 4次转账的数额，负数为学委的账户转出，正数为他人转入。


def transfer(amount):
    name = threading.current_thread().getName()
    print("%s 给xuewei转账 %s " % (name,amount))
    xuewei['balance'] += amount
    print("xuewei账户余额：", xuewei['balance'])


# 创建4个任务给学委转账上面lists的金额
for i in range(4):
    amount = lists[i]
    name = str(i)
    # mythread = threading.Thread(name=name, target=lambda: transfer(amount))
    def event():
        print("%s 计划转账 %s" % (name, amount))
        transfer(amount)
    mythread = threading.Thread(name=name, target=event)
    mythread.start()


# 等待3秒让上面的转账任务都完成，我们在看看账户余额
time.sleep(3)
print("-" * 16)
print("学委账户余额：", xuewei['balance'])

import random
import threading
import datetime
import time

xuewei = {'balance': 157}

lists = [-7, 20, -20, 7]  # 4次转账的数额，负数为学委的账户转出，正数为他人转入。
# 我们不要依赖amount变量了
def transfer():
    name = threading.current_thread().getName()
    xuewei['balance'] += lists[int(name)] #通过线程名字来获取对应金额
    print("xuewei账户余额：", xuewei['balance'])

# 创建4个任务给学委转账上面lists的金额
threads = []
for i in range(4):
    amount = lists[i]
    name = str(i)
    print("%s 计划转账 %s" % (name, amount))
    # mythread = threading.Thread(name=name, target=lambda: transfer())
    def event():
        transfer()
    mythread = threading.Thread(name=name, target=event)
    threads.append(mythread)

# 开始转账
for t in threads:
    t.start()

# 等待3秒让上面的转账任务都完成，我们在看看账户余额
time.sleep(3)
print("-" * 16)
print("学委账户余额：", xuewei['balance'])