imports and py3 compatibility

[fchap...@gmail.com]

Hello,

I have a question about imports in cython and python2/python3 compatibility.

I am working on sagemath, with a large number of cython files.

To ensure compatibility with both py2 and py3, is it necessary in cython files (just as in python files) to add

from __future__ import absolute_import

and to change the imports to the python3 syntax ?

And what about the cimports ?

Is there any tool available to do this cleanly for me ? Something like futurize ?

Frederic

[Hai Nguyen]

On Monday, August 15, 2016, <fchap...@gmail.com> wrote:

Hello,

I have a question about imports in cython and python2/python3 compatibility.

I am working on sagemath, with a large number of cython files.

To ensure compatibility with both py2 and py3, is it necessary in cython files (just as in python files) to add

from __future__ import absolute_import

and to change the imports to the python3 syntax ?

And what about the cimports ?

 Did you get trouble using cimport? I am not clear if this relates to py2 py3 issues. Hai

Is there any tool available to do this cleanly for me ? Something like futurize ?

Frederic

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[Robert Bradshaw]

On Mon, Aug 15, 2016 at 2:29 AM, <fchap...@gmail.com> wrote:
> Hello,
>
> I have a question about imports in cython and python2/python3 compatibility.
>
> I am working on sagemath, with a large number of cython files.
>
> To ensure compatibility with both py2 and py3, is it necessary in cython
> files (just as in python files) to add
>
> from __future__ import absolute_import
>
> and to change the imports to the python3 syntax ?

By default, Cython assumes code is Python 2 but produces extensions
compatible with Python 3. Somewhat in jest, Cython has been called the
easiest way to port Python 2 code to Python 3--just compile it.

Cython does support "from __future__ import absolute_import" and if
you use this, you do have to change the imports to be Python 3
compatible.

> And what about the cimports ?

Exactly the same as imports.

> Is there any tool available to do this cleanly for me ? Something like
> futurize ?

Not that I know of, but for just fixing [c]imports a simple script
probably wouldn't be too hard to put together.