Python的线程隔离实现方法

 前段时间看了下flask的源码，对于这样一个轻量级的web框架是怎样支持多线程的感到非常好奇，于是深入了解了一番。

flask是依赖werkeug来实现线程间的隔离的，而werkeug最后又使用到了python的内置模块locals来承载数据，看不如写，于是自己实现了一下。

from threading import currentThread, Thread
from collections import defaultdict

import sys


class LocalProxy(object):

    def __init__(self):
        self.local = defaultdict(dict)

    def __repr__(self):
        return str(self.local)

    def __str__(self):
        return str(self.local)

    def __getitem__(self, item):
        return self.local[currentThread().ident][item]

    def __setitem__(self, key, value):
        self.local[currentThread().ident].update({key: value})

print(sys.version)
local_proxy = LocalProxy()
print(local_proxy)

local_proxy["main"] = "start"

def change_property():
    local_proxy["main"] = "end"

change_thread = Thread(target=change_property)
change_thread.daemon= True
change_thread.start()

change_thread.join()

print(local_proxy)