Andrew Svetlov
Wed Dec 26 12:37:13 CET 2012Previous message:
[Python-Dev] Raising OSError concrete classes from errno code
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On Wed, Dec 26, 2012 at 12:16 PM, Nick Coghlan <
> wrote: > On Wed, Dec 26, 2012 at 6:50 PM, Serhiy Storchaka <
> wrote: >> On 25.12.12 23:55, Andrew Svetlov wrote: >>>>>> Currently we have exception tree of classes inherited from OSError >>> When we use C API we can call PyErr_SetFromErrno and >>> PyErr_SetFromErrnoWithFilename[Object] functions. >>> This ones raise concrete exception class (FileNotFoundError for >>> example) looking on implicit errno value. >>> I cannot see the way to do it from python. >>>>>>>>> raise OSError(errno.ENOENT, 'No such file or directory', 'qwerty') >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> FileNotFoundError: [Errno 2] No such file or directory: 'qwerty' >> As Serhiy's example shows, this mapping of error numbers to subclasses > is implemented directly in OSError.__new__. We did this so that code > could catch the new exceptions, even when dealing with old code that > raises the legacy exception types. >Sorry. Looks like OSError.__new__ requires at least two arguments for executing subclass search mechanism: >>> OSError(errno.ENOENT) OSError(2,) >>> OSError(errno.ENOENT, 'error msg') FileNotFoundError(2, 'error msg') I had tried first one and got confuse. >
http://docs.python.org/3/library/exceptions#OSError
could probably do > with an example like the one quoted in order to make this clearer >Added
http://bugs.python.org/issue16785
for this. > Cheers, > Nick. >>> -- > Nick Coghlan |
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-- Thanks, Andrew Svetlov
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