[Python-ideas] Re: Filtered wildcard imports?
On Mon, 3 Aug 2020 at 08:26, Dominik Vilsmeier wrote:
>
> On 02.08.20 15:36, Sebastian M. Ernst wrote:
>
> > Hi all,
> >
> > yet another (possibly bad?) idea from day-to-day work ...
> >
> > I occasionally need to import a lot of "stuff" from certain modules. The
> > "stuff" is usually following a pattern. E.g. I have modules that
> > (mostly) collect special exception classes and I usually need them all
> > in one push - but nothing else from those modules.
>
> It seems the responsibility of the package / distribution you are using
> to provide appropriate namespaces for their objects. If this "stuff" is
> following a certain pattern it seems to be distinct from other parts of
> the module, especially since you as a user have the need to only import
> those objects. So if they lived in their own namespace then you could
> simply do
>
> from somepkg.errors import *
And of course if they don't do that, you can yourself do:
somepkg_errors.py
```
import somepkg
__all__ = [x for x in dir(somepkg) if x.endswith('Error')]
```
Your program
```
from somepkg_errors import *
```
Paul
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[Python-ideas] Re: Filtered wildcard imports?
On 02.08.20 15:36, Sebastian M. Ernst wrote: Hi all, yet another (possibly bad?) idea from day-to-day work ... I occasionally need to import a lot of "stuff" from certain modules. The "stuff" is usually following a pattern. E.g. I have modules that (mostly) collect special exception classes and I usually need them all in one push - but nothing else from those modules. It seems the responsibility of the package / distribution you are using to provide appropriate namespaces for their objects. If this "stuff" is following a certain pattern it seems to be distinct from other parts of the module, especially since you as a user have the need to only import those objects. So if they lived in their own namespace then you could simply do from somepkg.errors import * ___ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/G4VBY26AOYHF4WUCNDM73T5EPLMHBF2G/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-ideas] Re: Filtered wildcard imports?
On Sun, Aug 02, 2020 at 03:36:44PM +0200, Sebastian M. Ernst wrote:
> Hi all,
>
> yet another (possibly bad?) idea from day-to-day work ...
>
> I occasionally need to import a lot of "stuff" from certain modules. The
> "stuff" is usually following a pattern. E.g. I have modules that
> (mostly) collect special exception classes and I usually need them all
> in one push - but nothing else from those modules.
When I have a similar requirement, I do something like this:
stuff_to_import = ['SomeError', 'AnotherError']
exec("from somemodule import %s" % ', '.join(stuff_to_import))
del stuff_to_import
(by memory, so the details may not be exactly correct).
Another possibility is to offer the stuff to import in the library
module:
# somemodule.py
errors = ['SomeError', 'AnotherError']
# caller
from somemodule import errors as errors
exec("from somemodule import %s" % ', '.join(errors))
del errors
The list of stuff to import can even be generated programmatically, by
name or functionality:
# the very end of somemodule.py
errors = [name for name, obj in globals().items()
if isinstance(obj, type) and issubclass(obj, Exception)]
Another option:
# Caller
import somemodule
globals().update({name: obj for name, obj in vars(somemodule).items()
if isinstance(obj, type) and issubclass(obj, Exception)})
The bottom line here is that we can be far more flexible about filtered
imports than mere wild cards in the names, and in a lot fewer lines of
code than you've been using.
--
Steven
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[Python-ideas] Re: Filtered wildcard imports?
Why not just import the module they're defined in and then just do attribute access syntax? from mod.modb.dtx import somemod somemod.SomeError ___ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/2ANGDC6RQ25YT3CAFZVE7XFO3MQSLS7D/ Code of Conduct: http://python.org/psf/codeofconduct/
