Replace deprecated imp module with importlib

[hugovk]

🌱 Describe your Feature Request

This library uses the imp module which has been deprecated since Python 3.4 and set for removal in 3.12:

• Raised PendingDeprecationWarning since 3.4 (2014)
• Raised DeprecationWarning since 3.5 (2015)
• Updated DeprecationWarning to say removal in 3.12 since 3.10 (2021)
• Removal planned for 3.12 (2023)

Python 3.12 is set for release on 2023-10-02 and this library is one of the top 5,000 most-downloaded from PyPI.

Please could you upgrade to use importlib? The imp docs have suggestions on what to use to replace each function and constant.

[TobyRoseman]

I agree. This is something we'll need to address before we can support Python 3.12.

Our only usage of imp is in setup.py. We are only using load_source from imp.

The imp docs have suggestions on what to use to replace each function and constant.

I'm actually not seeing any suggestions for load_source.

@hugovk - any ideas what we should be using?

[hugovk]

See pyinvoke/invoke#215 for a PR that replaced it with importlib.machinery import SourceFileLoader a few years back.

That code was just updated now looks like this:

from importlib.util import spec_from_loader
from types import ModuleType

try:
    from importlib.machinery import SourceFileLoader
except ImportError:  # PyPy3
    from importlib._bootstrap import (  # type: ignore[no-redef]
        _SourceFileLoader as SourceFileLoader,
    )


def load_source(name: str, path: str) -> Dict[str, Any]:
    if not os.path.exists(path):
        return {}
    loader = SourceFileLoader("mod", path)
    mod = ModuleType("mod")
    mod.__spec__ = spec_from_loader("mod", loader)
    loader.exec_module(mod)
    return vars(mod)

Does that help?

[TobyRoseman]

@hugovk - yes, this is very helpful. Thank you.

[teelrabbit]

@hugovk - yes, this is very helpful. Thank you. I addressed and fixed this issue in #2170

[YifanShenSZ]

Fixed by PR 2170