结论：ThreadLocal解决了参数在一个线程中各个函数之间互相传递的问题，一个ThreadLocal变量虽然是全局变量，但每个线程都只能读写自己线程的独立副本，互不干扰
import threading
local_school = threading.local()
def process_student():
std = local_school.student
print(f'Hello {std} in {threading.current_thread().name}')
def process_thread(name):
local_school.student = name
process_student()
t1 = threading.Thread(target=process_thread, args=('bob',), name='Thead-A')
t2 = threading.Thread(target=process_thread, args=('lily',), name='Thead-B')
t1.start()
t2.start()
t1.join()
t2.join()
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