[Python编程(第4版)].(Programming.Python.4th.Edition).Mark.Lutz.文字版

[4] => 4 [0] => 0 [1] => 1 [2] => 2 [3] => 3 [3] => 4 [2] => 3 [1] => 2 [2] => 4 [0] => 1 [1] => ...

class Mythread(threading.Thread): # subclass Thread object def init(self, myId, count, mutex): self.myId = myId self.count = cou ...

In other words, this script simply provides methods expected by the Thread framework. The advantage of taking this more coding-i ...

As a rule of thumb, class-based threads may be better if your threads require per-thread state, or can leverage any of OOP’s man ...

Example 5-12. PP4E\System\Threads\thread-add-random.py "prints different results on different runs on Windows 7" import threadin ...

global count with addlock: count = count + 1 # auto acquire/release around stmt time.sleep(0.5) with addlock: count = count + 1 ...

The Python queue module implements this storage device. It provides a standard queue data structure—a first-in first-out (fifo) ...

thread.start_new_thread(producer, (i,)) time.sleep(((numproducers-1) * nummessages) + 1) print('Main thread exit.') Before I sho ...

This is either a feature or nonfeature, depending on your program—it allows spawned worker threads to finish their tasks in the ...

consumer 1 got => [producer id=2, count=1] consumer 1 got => [producer id=1, count=3] consumer 1 got => [producer id=3, ...

remains active and continues responding to its users. Although such tasks can be run as processes, the efficiency and shared-sta ...

Chapter 9, the thread queue tools implemented in Chapter 10, and the PyMailGUI example in Chapter 14. Later in this chapter, we’ ...

More on the Global Interpreter Lock Although it’s a lower-level topic than you generally need to do useful thread work in Python ...

address higher-level synchronization issues at all. For example, as we saw, when more than one thread might attempt to update th ...

and reacquire the GIL around long-running operations to let the Python language por- tions of other Python threads run during th ...

normally exit when Python falls off the end of the file, but we may also call for program exit explicitly with tools in the sys ...

... print('Ignored...') Bye sys world Ignored... >>> try: ... later() ... finally: ... print('Cleanup') Bye sys world C ...

>>> from testexit_os import outahere >>> try: ... outahere() ... finally: ... print('Cleanup') Bye os world # ...

>>> pipe.read() 'Bye sys world\012' >>> stat = pipe.close() # returns exit code >>> stat 10752 >&g ...

Output stream buffering: A first look Notice that the last test in the preceding code didn’t attempt to read the command’s outpu ...