[英]try/except not catching a specific type of exception
我正在嘗試捕獲函數調用中拋出的特定類型的異常。 我在try / except塊中包含了函數調用,其中except塊捕獲了拋出的特定異常。 我仍然得到該異常的系統失敗堆棧跟蹤,除非我還包含所有異常的常規catch。 在包含該塊並檢查被捕獲的異常的類型時,我看到它正在捕獲我想要在第一個塊中捕獲的異常類型。 不知道為什么會這樣。
上下文:使用webapp2和ndb處理谷歌應用引擎應用。 文件函數有一個init .py,它從exceptions.py中導入所有異常
模擬代碼和結構
utils的/功能/ exceptions.py
"""
Custom exception types
"""
class InvalidParamsException(Exception):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return repr(self.msg)
車型/ models.py
import os, sys
sys.path.append(os.path.join(os.path.dirname(__file__), ".."))
import utils.functions as func
<-->
class ModelClass(ndb.Model):
@classmethod
def new(cls):
<-->
raise func.InvalidParamsException("Invalid Params to function!")
<-->
routes.py
import utils.functions as func
from models import ModelClass
class ModelClassHandler(webapp2.RequestHandler):
def post(self):
try:
new_model = ModelClass.new()
except func.InvalidParamsException as e:
logging.debug("Caught the right Exception!!")
except Exception as e:
logging.debug(":(")
logging.debug("EXCEPTION TYPE - %s"%str(type(e)))
如果我不包括第二個常規除了塊,我得到的輸出是:
Traceback (most recent call last):
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 1102, in __call__
return handler.dispatch()
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2-2.5.2/webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "{{my_path}}/routes.py", line 58, in post
new_model = ModelClass.new()
File "{{my_path}}/models/models.py", line 559, in new
raise func.InvalidParamsException("Invalid Params to function!")
InvalidParamsException: 'Invalid Params to function!'
如果我確實包含第二個塊,我會優雅地傳遞路由/函數,並在日志中看到:
DEBUG 2016-03-25 01:01:03,221 routes.py:66] EXCEPTION TYPE - <class 'utils.functions.exceptions.InvalidParamsException'>
幫助/指導非常感謝!!
看起來Python引發了在當前命名空間中導入的異常。 我最好的evicende是事實,回溯的最后一行調用引發的異常“InvalidParamsException”而不是“somemodule.InvalidParamsException”。
因此,我建議解決名稱空間沖突,將異常明確地導入到“routes.py”的命名空間中:
from utils.functions.exceptions import InvalidParamsException
並通過其現在解析的命名空間名稱捕獲異常:
except InvalidParamsException as inv_param_exp: <...>
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