python 中的全局变量global

#-*-utf-8-*-
import threading,time
x='out'
class MyThread(threading.Thread):
    def __init__(self,threadname):
        threading.Thread.__init__(self, name=threadname)
    
    def run(self):
        global x                       调用外部变量
        for i in range(10):
            print x
            time.sleep(2)

if __name__ == '__main__':
    obj = MyThread("this is my thread")
    obj.start()
    print "main is over"