flake8 has an incompatible pyflakes

[informatimago (Pascal J. Bourguignon)]

With both py27 and py35 versions of pyflakes and flake8, the version of pyflakes installed is 1.5.0 and it's incompatible with the requirements of flake8:

[pjb@macbook-trustonic :0.0 dev_kinibi_wb_sdk-LP34315237]$ sudo port select --set flake8 flake8-35
Selecting 'flake8-35' for 'flake8' succeeded. 'flake8-35' is now active.
[pjb@macbook-trustonic :0.0 dev_kinibi_wb_sdk-LP34315237]$ which flake8
/opt/local/bin/flake8
[pjb@macbook-trustonic :0.0 dev_kinibi_wb_sdk-LP34315237]$ $(which flake8) --version
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 655, in _build_master
    ws.require(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 963, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 854, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (pyflakes 1.5.0 (/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages), Requirement.parse('pyflakes!=1.2.0,!=1.2.1,!=1.2.2,<1.4.0,>=0.8.1'), {'flake8'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/local/bin/flake8", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 3019, in <module>
    @_call_aside
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 3003, in _call_aside
    f(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 3032, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 657, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 670, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 849, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pyflakes!=1.2.0,!=1.2.1,!=1.2.2,<1.4.0,>=0.8.1' distribution was not found and is required by flake8
[pjb@macbook-trustonic :0.0 dev_kinibi_wb_sdk-LP34315237]$ sudo port select --set flake8 flake8-27
Selecting 'flake8-27' for 'flake8' succeeded. 'flake8-27' is now active.
[pjb@macbook-trustonic :0.0 dev_kinibi_wb_sdk-LP34315237]$ $(which flake8) --version
Traceback (most recent call last):
  File "/opt/local/bin/flake8", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3019, in <module>
    @_call_aside
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3003, in _call_aside
    f(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3032, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 657, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 670, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources/__init__.py", line 849, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pyflakes!=1.2.0,!=1.2.1,!=1.2.2,<1.4.0,>=0.8.1' distribution was not found and is required by flake8
[pjb@macbook-trustonic :0.0 dev_kinibi_wb_sdk-LP34315237]$ 

[mf2k (Frank Schima)]

In the future, please use the actual port names in the Port field and Cc the port maintainers (port info --maintainers py-flake8 py-pyflakes), if any.

[petrrr]

In the meantime this was fixed by the update of py-flake8 to version 3.3.0 commit: [466406233b4669560ca71f8a4067006de34b591c/macports-ports]

However, this kind of issues are somewhat difficult to avoid.

Macports supports only one single version of a Python package while py-flake8 is pretty picky wrt. to the versions of its dependencies. In particular, it introduces caps on the versions. So if these ports (py-pyflakes and py-flake8) are updated out of sync such an situation can occur. Occasionally it also took quite some while until a new version of py-flake8 became available.