전: Python: threading. local 은 전역 변수 이지 만 값 은 현재 호출 된 스 레 드 에 있 습 니 다.

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Description: test the threading.local class
# Create: 2008-6-4
# Author: MK2[[email protected]]
from threading import local, enumerate, Thread, currentThread

local_data = local()
local_data.name = 'local_data'

class TestThread(Thread):
        def run(self):
                print currentThread()
                print local_data.__dict__
                local_data.name = self.getName()
                local_data.add_by_sub_thread = self.getName()
                print local_data.__dict__

if __name__ == '__main__':
        print currentThread()
        print local_data.__dict__
        
        t1 = TestThread()
        t1.start()
        t1.join()
        
        t2 = TestThread()
        t2.start()
        t2.join()
        
        print currentThread()
        print local_data.__dict__

    ：

def _patch(self):
    key = object.__getattribute__(self, '_local__key')
    d = currentThread().__dict__.get(key)
    if d is None:
        d = {}
        currentThread().__dict__[key] = d
        object.__setattr__(self, '__dict__', d)

        # we have a new instance dict, so call out __init__ if we have
        # one
        cls = type(self)
        if cls.__init__ is not object.__init__:
            args, kw = object.__getattribute__(self, '_local__args')
            cls.__init__(self, *args, **kw)
    else:
        object.__setattr__(self, '__dict__', d)