How can I more easily suppress previous exceptions when I raise my own exception in response?

问题

Consider

try:
   import someProprietaryModule
except ImportError:
   raise ImportError('It appears that <someProprietaryModule> is not installed...')

When run, if someProprietaryModule is not installed, one sees:

(traceback data)
ImportError: unknown module: someProprietaryModule

During handling of the above exception, another exception occurred:

(traceback data)
ImportError: It appears that <someProprietaryModule> is not installed...

Perhaps I don't want the "During handling of the above exception..." line (and the lines above it) to appear. I could do this:

_moduleInstalled = True
try:
   import someProprietaryModule
except ImportError:
   _moduleInstalled = False
if not _moduleInstalled: 
   raise ImportError('It appears that <someProprietaryModule> is not installed...')

But that feels like a bit of a hack. What else might I do?

回答1:

In Python 3.3 and later raise ... from None may be used in this situation.

try:
   import someProprietaryModule
except ImportError:
   raise ImportError('It appears that <someProprietaryModule> is not installed...') from None

This has the desired results.

回答2:

This can be done like this in Python 2.7 and Python 3:

try:
    import someProprietaryModule
except ImportError as e:
    raised_error = e

if isinstance(raised_error, ImportError):
    raise ImportError('It appears that <someProprietaryModule> is not installed...')

来源：https://stackoverflow.com/questions/17091520/how-can-i-more-easily-suppress-previous-exceptions-when-i-raise-my-own-exception

标签

python

exception

python-3.x

python-3.3

traceback