Thanks for your reply! Yes, move the code from positionA(can run normally) to positionB(exception with name undefined) I find this content "https://docs.python.org/3.3/tutorial/classes.html#python-scopes-and-namespaces"; But I still don't undewrstand the differenct of scopes-and-namespaces between positionA and positionB, I think the variable "aLock" at these positionA or positionB are all global. The function can find threading.RLock() by name ""aLock".
At 2018-08-09 23:51:45, "Karsten Hilbert" <karsten.hilb...@gmx.net> wrote: >On Thu, Aug 09, 2018 at 11:16:37PM +0800, xuanwu348 wrote: > >> The problem I meet when I add "aLOCK = threading.RLock()" to PositionB, the >> program will report error "name 'aLOCK' is not defined ", > >You mean to say: *move*, not *add*. > >That is why aLock is out of scope. > > ..../python3-doc/html/tutorial/classes.html#python-scopes-and-namespaces > >> but when I change this code to PositionA, it can run normally, is there any >> difference for the code between 'if __name__ == "__main__:"', can you help >> me, thanks! >> >> The file I was attached, please change the extend ".pyx" to ".py", thanks, >> code as below, tried python2.7 and python3.4: >> >> import threading >> import time >> from multiprocessing import Process >> >> #PositionA >> aLOCK = threading.RLock() >> >> def Save_runnedCMD(filename, strings): >> aLOCK.acquire() >> with open(filename, "at") as f: >> f.write(str(strings) + "\n\r") >> aLOCK.release() >> >> def runCMD(filename): >> time.sleep(1) >> cmd = "testtest" >> Save_runnedCMD(filename, cmd) >> >> >> def Thr_run(filename): >> t = [] >> for i in range(2): >> tt = threading.Thread(target = runCMD, args=(filename,)) >> tt.start() >> t.append(tt) >> for tt in t: >> tt.join() >> >> if __name__ == "__main__": >> filename = "./testaaaaa.log" >> >> #PositionB >> #aLOCK = threading.RLock() >> >> while 1: >> t1 = Process(target=Thr_run, args=(filename, )) >> t1.start() >> t1.join() >> >> Error info as below: >> D:\Appppp>python testa.py >> Exception in thread Thread-1: >> Traceback (most recent call last): >> File "C:\Python34\lib\threading.py", line 921, in _bootstrap_inner >> self.run() >> File "C:\Python34\lib\threading.py", line 869, in run >> self._target(*self._args, **self._kwargs) >> File "D:\Appppp\testa.py", line 15, in runCMD >> Save_runnedCMD(filename, cmd) >> File "D:\Appppp\testa.py", line 7, in Save_runnedCMD >> aLOCK.acquire() >> NameError: name 'aLOCK' is not defined >> >> Exception in thread Thread-2: >> Traceback (most recent call last): >> File "C:\Python34\lib\threading.py", line 921, in _bootstrap_inner >> self.run() >> File "C:\Python34\lib\threading.py", line 869, in run >> self._target(*self._args, **self._kwargs) >> File "D:\Appppp\testa.py", line 15, in runCMD >> Save_runnedCMD(filename, cmd) >> File "D:\Appppp\testa.py", line 7, in Save_runnedCMD >> aLOCK.acquire() >> NameError: name 'aLOCK' is not defined >> -- >> https://mail.python.org/mailman/listinfo/python-list > >-- >GPG 40BE 5B0E C98E 1713 AFA6 5BC0 3BEA AC80 7D4F C89B >-- >https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
