py-path: Could not find suitable distribution for Requirement.parse('toml')

[ryandesign (Ryan Carsten Schmidt)]

​py-path doesn't build:

WARNING: The pip package is not available, falling back to EasyInstall for handling setup_requires/test_requires; this is deprecated and will be removed in a future version.

Note: Bypassing https://pypi.org/simple/toml/ (disallowed host; see http://bit.ly/2hrImnY for details).

Couldn't find index page for 'toml' (maybe misspelled?)

Note: Bypassing https://pypi.org/simple/ (disallowed host; see http://bit.ly/2hrImnY for details).

No local packages or working download links found for toml
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/installer.py", line 62, in fetch_build_egg
    pkg_resources.get_distribution('pip')
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 481, in get_distribution
    dist = get_provider(dist)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 357, in get_provider
    return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 900, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip' distribution was not found and is required by the application

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "setup.py", line 6, in <module>
    setuptools.setup()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/__init__.py", line 144, in setup
    _install_setup_requires(attrs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/__init__.py", line 139, in _install_setup_requires
    dist.fetch_build_eggs(dist.setup_requires)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/dist.py", line 718, in fetch_build_eggs
    resolved_dists = pkg_resources.working_set.resolve(
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 780, in resolve
    dist = best[req.key] = env.best_match(
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1065, in best_match
    return self.obtain(req, installer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1077, in obtain
    return installer(requirement)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/dist.py", line 777, in fetch_build_egg
    return fetch_build_egg(self, req)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/installer.py", line 70, in fetch_build_egg
    return _legacy_fetch_build_egg(dist, req)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/installer.py", line 53, in _legacy_fetch_build_egg
    return cmd.easy_install(req)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/setuptools/command/easy_install.py", line 679, in easy_install
    raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('toml')

Probably missing dependency(ies?)

[reneeotten (Renee Otten)]

In 03bb31518f4103e81d6b1e84b10faf8db0cfeaf8/macports-ports (master):

py-path: fix dependencies, revert to 13.1.0 for PY35

Closes: #60231