我對Python還比較陌生，并嘗試為for循環實現一個多處理模塊。

我有一個圖像url數組存儲在img_url中，我需要下載并應用一些Google vision。if __name__ == '__main__':

img_urls = [ALL_MY_Image_URLS]

runAll(img_urls)

print("--- %s seconds ---" % (time.time() - start_time))

這是我的runAll()方法def runAll(img_urls):

num_cores = multiprocessing.cpu_count()

print("Image URLS {}",len(img_urls))

if len(img_urls) > 2:

numberOfImages = 0

else:

numberOfImages = 1

start_timeProcess = time.time()

pool = multiprocessing.Pool()

pool.map(annotate,img_urls)

end_timeProcess = time.time()

print('\n Time to complete ', end_timeProcess-start_timeProcess)

print(full_matching_pages)

def annotate(img_path):

file = requests.get(img_path).content

print("file is",file)

"""Returns web annotations given the path to an image."""

print('Process Working under ',os.getpid())

image = types.Image(content=file)

web_detection = vision_client.web_detection(image=image).web_detection

report(web_detection)

當我運行它并且python崩潰時，我得到這個警告objc[67570]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.

objc[67570]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

objc[67567]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.

objc[67567]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

objc[67568]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.

objc[67568]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

objc[67569]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.

objc[67569]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

objc[67571]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.

objc[67571]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

objc[67572]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.

objc[67572]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

總結

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