2017-04-13 79 views
0

我想将一些JSON对象和两个整数传递给一个池。Python TypeError - 所需的类似字节的对象,而不是str

for i in range(0, multiprocessing.cpu_count()-1): 
    fromindex = i * chunklen 
    toindex = (i+1) * chunklen 
    chunkedData.append([data['features'][fromindex:toindex], weekdaytopredict, hourtopredict]) 
chunkedData.append([data['features'][toindex:], weekdaytopredict, hourtopredict]) 
parallelstart = time.time() 
result = (pool.map(parallelUpdateWithDT, chunkedData)) 

data是带有一些多边形的geoJSON文件。我想分发这些多边形进行并行处理。我将n/cpu_count()多边形传递给parallelUpdateWithDT函数,该函数应该进一步处理它们。我的问题是typeerror:即使print(chunkedData)返回<class 'list'>,我geth以下错误:TypeError: a bytes-like object is required, not 'str'。我在哪里搞砸了?完整堆栈跟踪:

--------------------------------------------------------------------------- 
RemoteTraceback       Traceback (most recent call last) 
RemoteTraceback: 
""" 
Traceback (most recent call last): 
    File "/usr/lib/python3.5/multiprocessing/pool.py", line 119, in worker 
    result = (True, func(*args, **kwds)) 
    File "/usr/lib/python3.5/multiprocessing/pool.py", line 44, in mapstar 
    return list(map(*args)) 
    File "<ipython-input-114-bf56cacb90b9>", line 34, in parallelUpdateWithDT 
    if('rain' in result): 
TypeError: a bytes-like object is required, not 'str' 
""" 

The above exception was the direct cause of the following exception: 

TypeError         Traceback (most recent call last) 
<ipython-input-115-031a5e24ee66> in <module>() 
----> 1 decisionTreePrediciton(3, 5) 

<ipython-input-114-bf56cacb90b9> in decisionTreePrediciton(weekdaytopredict, hourtopredict) 
    15  print (type(chunkedData)) 
    16 
---> 17  result = (pool.map(parallelUpdateWithDT, chunkedData)) 
    18  parallelend = time.time() 
    19 

/usr/lib/python3.5/multiprocessing/pool.py in map(self, func, iterable, chunksize) 
    258   in a list that is returned. 
    259   ''' 
--> 260   return self._map_async(func, iterable, mapstar, chunksize).get() 
    261 
    262  def starmap(self, func, iterable, chunksize=None): 

/usr/lib/python3.5/multiprocessing/pool.py in get(self, timeout) 
    606    return self._value 
    607   else: 
--> 608    raise self._value 
    609 
    610  def _set(self, i, obj): 

chunkedData样本:

[[[{'geometry': {'coordinates': [[[10.914622377957983, 45.682007076150505], [10.927456267537572, 45.68179119797432], [10.927147329501077, 45.672795442796335], [10.914315493899755, 45.67301125363092], [10.914622377957983, 45.682007076150505]]], 'type': 'Polygon'}, ///////////////////////etc, waaay too big////////////, 'id': 6574, 'properties': {'cellId': 11454}}], 3, 5] 

这是怎么一个str?我不明白。谢谢你的帮助!

+0

工作人员在'if('rain'in结果):'并将其传播给父母并在那里重新提出,让其知道发生了什么。问题在于这里没有发布的工作者代码。我猜'结果'是一个不在块中的计算值。您可以在该行的上方添加“print(repr(result))”,并查看您获得的内容。但是由于这个错误代码没有发布,所以我们不能说太多。 – tdelaney

回答

3

从您发布的代码中无法分辨出来,但我怀疑您试图检查str是否为in a bytes。例如:

>>> bytes_obj = b'result' 
>>> 'res' in bytes_obj 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
TypeError: a bytes-like object is required, not 'str' 

这意味着result在你的代码是bytes类型。这里有两个解决方案。首先是使'rain'成字节对象太:

if b'rain' in result: 
    ... 

二是把resultstr

result = result.decode(whatever_codec_it_should_be) 

如果你打算采取第二种方法,你应该转换导致str在尽可能早的时候,以避免各种strbytes头痛。通常,如果你不知道知道你需要一个不同的编解码器,现在大部分工作都是从utf-8这几天开始的,所以你可以试试那个...

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