python线程类改变类变量

python线程类改变类变量

#!/usr/bin/python3
import threading,time
class Rep2(threading.Thread):
    delay = 5
    def __init(self):
        threading.Thread.__init__(self)
        #self.delay = delay
        pass
    @classmethod
    def get_delay(cls):
        print('cls_delay:',cls.delay)

    @classmethod
    def set_delay(cls,delay):
        cls.delay = delay
        
    def run(self):
        while True:
            time.sleep(1)
            print('run_delay:',self.delay)


# #测试1
a = Rep2()
# 需要调用线程类的start()方法而不是run()方法,调用run()方法类变量delay的值不会改变
a.start() 
print("test1,started")
Rep2.get_delay()
time.sleep(5)
Rep2.delay = 2
Rep2.get_delay()
time.sleep(5)
Rep2.set_delay(222)
Rep2.get_delay()
'''
运行结果1：
test1,started
cls_delay: 5
run_delay: 5
run_delay: 5
run_delay: 5
run_delay: 5
run_delay: 5
cls_delay: 2
run_delay: 2
run_delay: 2
run_delay: 2
run_delay: 2
cls_delay: 222
run_delay: 222
run_delay: 222
run_delay: 222
'''
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import threading,time
class Rep2():
    delay = 5
    def __init(self):
        pass
        #self.delay = delay
    @classmethod
    def get_delay(cls):
        print('cls_delay:',cls.delay)

    @classmethod
    def set_delay(cls,delay):
        cls.delay = delay

    def run(self):
        print('run_delay:',self.delay)
a = Rep2()
a.run()
print("test2,started")
Rep2.get_delay()
time.sleep(5)
Rep2.delay = 2
Rep2.get_delay()
time.sleep(5)
Rep2.set_delay(222)
Rep2.get_delay()
a.run()
'''
run_delay: 5
test2,started
cls_delay: 5
cls_delay: 2
cls_delay: 222
run_delay: 222
'''
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