Tim Johnson <t...@akwebsoft.com> writes:
> Using python 2.7~
In Python 2, you should turn on the “default import is absolute” by
issuing the statement::
from __future__ import absolute_import
as one of the first statements in each module.
When you migrate your code to PYthon 3, that will be the default
behaviour.
> The packages is called 'controllers' and has a submodule named 'imp'
To avoid the module named ‘imp’ in the standard library, your code
should import ‘imp’ using a relative import. See PEP 328
<URL:https://www.python.org/dev/peps/pep-0328/#rationale-for-relative-imports>.
So, you'd do::
from . import imp
to import the ‘imp’ module relative to the current package.
> I do the following:
> >>> a = __import__('imp')
It is best to avoid calling dunder functions directly; they are
available for overriding the internals of language features, and
*invoking* one is best done by just using the corresponding language
feature.
Instead, use either the ‘import’ statement, or the ‘importlib’ standard
library module <URL:https://docs.python.org/2/library/importlib.html>,
specifically the ‘importlib.import_module’ function::
import importlib
a = importlib.import_module('.imp')
> Now, suppose a python upgrade provides a package called controllers or
> there's some great third-party package available called controllers.
You don't even have to imagine that far: there is already a standard
library module named ‘imp’, so you already have that problem to contend
with :-)
That is the distinction that led to “absolute” import versus “relative”
import.
> How do I access the 'global' controllers package?
* Enable “default import is absolute”, as described above.
* Issue a normal import statement: the absolute import search path will
be used.
I hope that helps.
--
\ “[I]t is impossible for anyone to begin to learn that which he |
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Ben Finney
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