[Python-ideas] lazy use for optional import

[Chris Barker]

Going through machinations to satisfy PEP 8 makes no sense -- it's s style
*guide* -- that's it.

-CHB


On Tue, Feb 28, 2017 at 3:31 PM, Nicolas Cellier <
contact at nicolas-cellier.net> wrote:

> I have seen some interest into lazy functionality implementation.
>
> I wondered if it can be linked with optional import.
>
> PEP 8 <http://www.python.org/dev/peps/pep-0008/> authoritatively states:
>
> Imports are always put at the top of the file, just after any module
> comments and docstrings, and before module globals and constants.
>
> So, if we want to stick to PEP8 with non mandatory import, we have to
> catch the import errors, or jail the class or function using extra
> functionnality.
>
> Why not using the potential lazy keyword to have a nice way to deal with
> it?
>
> For example:
>
> lazy import pylab as pl  # do nothing for now
>>
>> # do stuff
>>
>> def plot(*args):
>>     pl.figure() # Will raise an ImportError at this point
>>     pl.plot(...)
>>
>
> That way, our library will raise an ImportError only on plot func usage
> with an explicit traceback : if matplotlib is not installed, we will have
> the line where it is used for the first time and we will have the name of
> the faulty library.
>
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