当我提出自己的异常作为响应时，如何更轻松地抑制以前的异常？

Consider

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

运行时，如果未安装 someProprietaryModule，则会看到：

(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...

也许我不希望出现“在处理上述异常期间...”行（及其上面的行）。我可以这样做：

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

但这感觉有点像黑客。我还能做什么？

在 Python 3.3 及更高版本中raise ... from None可以在这种情况下使用。

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

这已经达到了预期的结果。