New submission from Armin Ronacher:
3.4 deprecates load_module on the loaders and now proposes to use create_module
(optionally) and exec_module. Unfortunately for external callers these
interfaces are not useful because you need to reimplement _SpecMethods.create
and a whole bunch of other stuff for it.
Right now a caller can get hold of _SpecMethods by importing from
_frozen_importlib but that seems very unsupported and is obviously entirely not
exposed.
Is there a reason those methods are not on the ModuleSpec directly but on a
private wrapper?
Example usage:
from types import ModuleType
from importlib.machinery import ModuleSpec, SourceFileLoader
from _frozen_importlib import _SpecMethods
loader = SourceFileLoader('plugin_base', 'my_file.py')
spec = ModuleSpec(name=loader.name, loader=loader)
mod = _SpecMethods(spec).create()
In the absence of _SpecMethods a caller needs to do this:
from importlib.machinery import ModuleSpec, SourceFileLoader
loader = SourceFileLoader('plugin_base', 'my_file.py')
spec = ModuleSpec(name=loader.name, loader=loader)
if not hasattr(loader, 'create_module'):
module = types.ModuleType(loader.name)
else:
module = loader.create_module(spec)
module.__loader__ = loader
module.__spec__ = spec
try:
module.__package__ = spec.parent
except AttributeError:
pass
loader.exec_module(module)
(And that is not the whole logic yet)
----------
keywords: 3.4regression
messages: 216295
nosy: aronacher
priority: normal
severity: normal
status: open
title: importlib's spec module create algorithm is not exposed
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue21235>
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