Stop falling back to pkgutil

[jeffwidman]

Falling back to pkgutil is now discouraged:

Note Some older recommendations advise the following in the namespace package __init__.py:

try:
    __import__('pkg_resources').declare_namespace(__name__)
except ImportError:
    __path__ = __import__('pkgutil').extend_path(__path__, __name__)

The idea behind this was that in the rare case that setuptools isn’t available packages would fall-back to the pkgutil-style packages. This isn’t advisable because pkgutil and pkg_resources-style namespace packages are not cross-compatible. If the presence of setuptools is a concern then the package should just explicitly depend on setuptools via install_requires.

[jeffwidman]

Related: #322

[theacodes]

Hi, I wrote that referenced doc. Unfortunately, we can't switch unless we switched all google packages, and since it's infeasible to do that as it'll effectively bisect the entire package set (with packages before a certain date being unsafe to use with packages after a certain date).

…

On Tue, Feb 26, 2019, 5:59 PM Jeff Widman ***@***.***> wrote: Related: #322 <#322> — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#326 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAPUc8ewFpBpsYHqstqhldikMq-R4Qxyks5vReZ1gaJpZM4bThuQ> .

[jeffwidman]

Hi, I wrote that referenced doc.

😄