0704 process inheritance enables multi-process, pool process pools, and pool to implement multi-process replication files

Implementation of process multi-processes by means of inheritance

1  fromMultiprocessingImportProcess2 Import Time3 4 classmynewprocess (Process):5     defRun (self):6          forIinchRange (10):7             Print("----Run----")8Time.sleep (1)9 Ten  One if __name__=="__main__": Ap =mynewprocess () -  -P.start ()#the Start method in process actively calls the Run method the  forIinchRange (10):Print("---main---") Time.sleep (1)

Pool process pooling for multi-process

1 Import Time2  fromMultiprocessingImportPool3 4 defworker ():5      forIinchRange (10):6         Print("From worker%s"%i)7Time.sleep (0.5)8 9 deffoo ():Ten      forIinchRange (10): One         Print("From foo%s"%i) ATime.sleep (0.5) -  - defBar (): the      forIinchRange (10): -         Print("From Bar%s"%i) -Time.sleep (0.5) -  + if __name__=="__main__": -Pool = Pool (3)#Create three processes + Pool.apply_async (worker) A Pool.apply_async (foo) at Pool.apply_async (BAR) -  -Pool.close ()#Close Process pool, prohibit Add task -Pool.join ()#wait for the child process to finish before the main process goes down -     Print("IS-done ...") -  in  -  to #the process and Pool are finally called Fork + #Typically, half of the main process is used to wait for low ah,,, real tasks in the child process to execute

Use pool process pools for simple file copying

1 ImportOS2 Import Time3  fromMultiprocessingImportPool4 5 defcopyFile (OldPath, NewPath, fileName):6     Print("%s ready to replicate in ... "%fileName)7With open ("%s\%s"% (OldPath, fileName),'R') as FR, open ("%s\%s"% (NewPath, fileName),'W') as FW:8          forLineinchfr:9 Fw.write (line)TenTime.sleep (1) One  A  - if __name__=="__main__": -OldPath = R"file" theNewPath = R"file-Copy" -  - Os.mkdir (NewPath) -  +Pool = Pool (5) -  +FileList =Os.listdir (OldPath) A  at      forFileNameinchfileList: - Pool.apply_async (CopyFile, (OldPath, NewPath, fileName)) -  - pool.close () -  - Pool.join () in  -     Print("File copy complete....")

0704 process inheritance enables multi-process, pool process pools, and pool to implement multi-process replication files