Any support for FileNotFoundError?

[wimglenn]

In Python 3.3+ we can handle missing files easily:

try:
    open('unobtanium')
except FileNotFoundError:
    ...

In Python 2 there is a bit more song and dance:

try:
    open('unobtanium')
except IOError as err:
    if err.errno != errno.ENOENT:
        raise

Does this library allow us to write the simpler Python 3 style file handling in Python 2, somehow? If not, are there any plans to get FileNotFoundError into python-future, or is it too difficult to implement?

Thanks!

[edschofield]

Thanks for the request, Wim. This sounds like a good feature to have. Are you able to contribute a patch that defines `FileNotFoundError` in `src/future/builtins/__init__.py`? This would speed up the process of getting it supported. :-)

[edschofield]

I have committed a patch to a new development branch called exceptions. You can use the new PEP3151 exceptions with code like this:

from builtins import FileNotFoundError

at the top of modules that invoke those exceptions.

Could you please try the new branch and report back about how well this works for you?

[wimglenn]

Hi Ed, yes, I tried it and it seems to work fine:

>>> import sys; sys.version
'2.7.12 (default, Jun 29 2016, 14:05:02) \n[GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)]'
>>> from builtins import FileNotFoundError
>>> try:
...     open('unobtanium')
... except FileNotFoundError as err:
...     pass
... 
>>> err
IOError(2, 'No such file or directory')
>>> issubclass(FileNotFoundError, OSError)
True

[wimglenn]

@edschofield Are these going to make it into a release any time soon? Shall I close this issue? Thanks!

[jmadler]

I believe this is included in 0.17