Python:为什么要打印回溯？

Question

我有一个函数。该函数在更多线程中启动。我尝试打印自己的错误消息。但我做什么并不重要，我仍然会打印回溯。我的功能:

def getSuggestengineResultForThree(suggestengine, seed, dynamoDBLocation):
    results[seed][suggestengine] = getsuggestsforsearchengine(seed, suggestengine)

    for keyword_result in results[seed][suggestengine]:
        o = 0
        while True:
            try:
                allKeywords.put_item(
                    Item={
                        'keyword': keyword_result
                    }
                )
                break
            except ProvisionedThroughputExceededException as pe:
                if (o > 9):
                    addtoerrortable(keyword_result)
                    print('ProvisionedThroughputExceededException 10 times in getSuggestengineResultForThree for allKeywords')
                    break
                sleep(1)
                o = o + 1
                print("ProvisionedThroughputExceededException in getSugestengineResult")

但是我为每个线程得到这样的输出:

Exception in thread Thread-562:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
  File "/Users/iTom/ownCloud/Documents/Workspace/PyCharm/Keywords/TesterWithDB.py", line 362, in getSuggestengineResultForThree
'keyword': keyword_result
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/boto3/resources/factory.py", line 518, in do_action
response = action(self, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/boto3/resources/action.py", line 83, in __call__
response = getattr(parent.meta.client, operation_name)(**params)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/botocore/client.py", line 252, in _api_call
return self._make_api_call(operation_name, kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/botocore/client.py", line 542, in _make_api_call
raise ClientError(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred (ProvisionedThroughputExceededException) when calling the PutItem operation: The level of configured provisioned throughput for the table was exceeded. Consider increasing your provisioning level with the UpdateTable API

有人可以帮助我获得自己的打印而不是回溯吗？ :)

Answer 1

这个答案对于您的问题来说有点晚了，但这里是为了以防万一有人正在搜索这个答案。

boto3 抛出的异常是一个 botocore.exceptions.ClientError 正如 Neil 的回答。但是，您应该检查“ProvisionedThroughputExceededException”的响应错误代码，因为 ClientError 可能是另一个问题。

from botocore.exceptions import ClientError

except ClientError as e:
  if e.response['Error']['Code'] != 'ProvisionedThroughputExceededException':
    raise
  # do something else with 'e'

我正在使用Python 2.7，这可能会也可能不会产生影响。我收到的异常表明 boto3 已经在重试(最多 9 次)，这与您的异常不同:

An error occurred (ProvisionedThroughputExceededException) when calling the PutItem operation (reached max retries: 9): The level of configured provisioned throughput for the table was exceeded. Consider increasing your provisioning level with the UpdateTable API.