多处理池3

Question

我有一个脚本在Python 2个工作，我试图使它在Python工作3

一两件事，我偶然发现，并没有关于如何解决思路是事实在类Applyresult得到（）（）方法似乎是现在抛出：

在Pycharm回溯是：

Traceback (most recent call last): 
    File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 3.4.1\helpers\pydev\pydevd.py", line 1733, in <module> 
    debugger.run(setup['file'], None, None) 
    File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 3.4.1\helpers\pydev\pydevd.py", line 1226, in run 
    pydev_imports.execfile(file, globals, locals) # execute the script 
    File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 3.4.1\helpers\pydev\_pydev_execfile.py", line 38, in execfile 
    exec(compile(contents+"\n", file, 'exec'), glob, loc) #execute the script 
    File "D:/SRC/CDR/trunk/RegressionTests/ExeTests/pyQCDReg_Launcher.py", line 125, in <module> 
    result_list = ar.get() 
    File "C:\Python33\lib\multiprocessing\pool.py", line 564, in get 
    raise self._value 
TypeError: can't use a string pattern on a bytes-like object 

线违规是pool.py：

def get(self, timeout=None): 
    self.wait(timeout) 
    if not self.ready(): 
     raise TimeoutError 
    if self._success: 
     return self._value 
    else: 
     raise self._value // This is the line raising the exception 

它是由下面一行在我的脚本调用：

pool = Pool(processes=8) 
ar = pool.map_async(run_regtest, command_list) 
pool.close() 
start_time = time.time() 
while True: 
    elapsed = time.time() - start_time 
    if (ar.ready()): break 
    remaining = ar._number_left 
    print("Elapsed,", elapsed, ", Waiting for", remaining, "tasks to complete...") 
    time.sleep(30) 

pool.join() 
ar.wait() 
print("finished") 
result_list = ar.get() // This is the offending line causing the exception 

这个脚本是在Python 2个工作，我不明白为什么它不会出现在Python 3合作有没有人有一个想法，为什么？

Answer 1

从multiprocessing documentation：

GET（[超时]）

Return the result when it arrives. If timeout is not None and 
the result does not arrive within timeout seconds then 
multiprocessing.TimeoutError is raised. If the remote call 
raised an exception then that exception will be reraised by 
get(). 

这很可能对我来说，你的例外来自run_regtest。

当您从Python 2切换到Python 3时，您遇到的异常很常见。用于返回string的标准库（和其他库）中的许多函数现在返回bytes。 A bytes对象can be converted以字符串b.decode('utf-8')为例，您只需要知道编码。