from werkzeug.local import Local

class A(Local):
    b = 1

my_obj = A()
my_obj.b = 1


def worker():
    # 新线程
    my_obj.b = 2
    print('in new thread b is:' + str(my_obj.b))


new_t = threading.Thread(target=worker, name='qiyue_thread')
new_t.start()
time.sleep(1)
# 主线程
print('in main thread b is:' + str(my_obj.b))

我尝试用A继承Local类，但是最后输出的b都是1。不应该在new thread里面输出2吗

in new thread b is:1
in main thread b is:1