Thread-Specific State in Python

result of run

[morteza@ipo ~]$ python sample.py
Traceback (most recent call last):
  File "sample.py", line 29, in <module>
    print(s[2].p())
  File "sample.py", line 11, in p
    print(self.local.name)
AttributeError: '_thread._local' object has no attribute 'name'
[morteza@ipo ~]$ python sample.py 
Traceback (most recent call last):
  File "sample.py", line 29, in <module>
    print(s[2].p())
  File "sample.py", line 11, in p
    print(self.local.name)
AttributeError: '_thread._local' object has no attribute 'name'


[morteza@ipo ~]$ python sample.py 
140333562648320 Private
140333554255616 Private
140333543466752 Private
140333562648320 Private
140333543466752 Private
140333562648320 Private
140333543466752 Private
140333562648320 Private
140333562648320 Private
140333543466752 Private
Public

sample.py

import time
import threading

# main class
class x:
    def __init__(self):
        self.local = threading.local()    # <<< thread-specific data
        self.name = "Public"
        self.local.name = "Private"
        self.p()

    def p(self):
        print(threading.current_thread().ident, self.local.name)

# update list of instances by different threads
def y(s):
    s.append(x())


# spawn threads
t = []
s = []
for i in range(10):
    tmp = threading.Thread(target=y, args=(s,))
    t.append(tmp)
    tmp.start()

time.sleep(2)

# access to public variable
print(s[2].name)

# error lines
# print(s[2].local.name)   <<< could not access to name because of different thread
# print(s[2].p())          <<< could not access to name because of different thread

# release threads
for i in t:
    i.join()

https://www.safaribooksonline.com/library/view/python-cookbook-3rd/9781449357337/ch12s06.html