Incorrect value of constant NAMESPACE_PACKAGE_INIT

[Cykooz]

"Python Packaging User Guide" does not recommend to use namespace __init__.py with code like this:

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

https://packaging.python.org/guides/packaging-namespace-packages/#pkg-resources-style-namespace-packages

But constant NAMESPACE_PACKAGE_INIT contains this version of code.

setuptools/setuptools/wheel.py

Lines 30 to 35 in 53c284b

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

At least, this affects the "namespace-detector" in PyCharm. PyCharm does not support this method of namespace definition (because it is not recommended) - https://youtrack.jetbrains.com/issue/PY-38434).

Need to replace value of this constant with:

__path__ = __import__('pkgutil').extend_path(__path__, __name__)

[jaraco]

Thanks for the report. I believe the code can be replaced by just the pkg_resources declaration. That's the form that's meant to go along with packages that declare "namespace_packages". Is this change needed for Python 2 environments, or is the change in the master, Python-3-only branch okay?

[jaraco]

Also, this code is only used when setuptools converts a wheel to an egg, which should only really happen with setup_requires compatibility installations, which I wouldn't expect to be installed in a user's environment. Is this an actual issue or a just a potential one based on code search?