port uninstall --follow-dependents python35 removed part of py27- and py36- packages

[Alexey Luchko]

Hi,

I've decided to switch python from 3.5 to 3.6 and after a time, run a
command

$ sudo port uninstall --no-exec --follow-dependents python35

To my surprise were removed not only py35- packages and explicit python35
dependents like httpie, but also a number of py27- and py36- packages. All
the output follows

$ sudo port uninstall --no-exec --follow-dependents python35
Password:
--->  Deactivating py35-ipython @6.0.0_0
--->  Uninstalling py35-ipython @6.0.0_0
--->  Deactivating py35-appnope @0.1.0_0
--->  Uninstalling py35-appnope @0.1.0_0
--->  Deactivating py35-gnureadline @6.3.3_1
--->  Uninstalling py35-gnureadline @6.3.3_1
--->  Deactivating py35-pexpect @4.2.1_0
--->  Uninstalling py35-pexpect @4.2.1_0
--->  Deactivating py35-ptyprocess @0.5.1_0
--->  Uninstalling py35-ptyprocess @0.5.1_0
--->  Deactivating py35-simplegeneric @0.8.1_0
--->  Uninstalling py35-simplegeneric @0.8.1_0
--->  Deactivating py35-prompt_toolkit @1.0.9_0
--->  Uninstalling py35-prompt_toolkit @1.0.9_0
--->  Deactivating py35-pip @9.0.1_0
--->  Uninstalling py35-pip @9.0.1_0
--->  Deactivating py35-pyflakes @1.5.0_0
--->  Uninstalling py35-pyflakes @1.5.0_0
--->  Deactivating httpie @0.9.4_0
--->  Uninstalling httpie @0.9.4_0
--->  Deactivating py35-pygments @2.2.0_0
--->  Uninstalling py35-pygments @2.2.0_0
--->  Deactivating py35-setuptools @34.3.3_0
--->  Uninstalling py35-setuptools @34.3.3_0
--->  Deactivating py35-packaging @16.8_0
--->  Uninstalling py35-packaging @16.8_0
--->  Deactivating py27-pip @9.0.1_0
--->  Uninstalling py27-pip @9.0.1_0
--->  Deactivating py27-virtualenv @15.1.0_0
--->  Uninstalling py27-virtualenv @15.1.0_0
--->  Deactivating py27-pyflakes @1.5.0_0
--->  Uninstalling py27-pyflakes @1.5.0_0
--->  Deactivating py27-ipython @5.3.0_0
--->  Uninstalling py27-ipython @5.3.0_0
--->  Deactivating py27-prompt_toolkit @1.0.9_0
--->  Uninstalling py27-prompt_toolkit @1.0.9_0
--->  Deactivating py27-pygments @2.2.0_0
--->  Uninstalling py27-pygments @2.2.0_0
--->  Deactivating py27-setuptools @34.3.3_0
--->  Uninstalling py27-setuptools @34.3.3_0
--->  Deactivating py35-six @1.10.0_0
--->  Uninstalling py35-six @1.10.0_0
--->  Deactivating py35-pickleshare @0.7.4_0
--->  Uninstalling py35-pickleshare @0.7.4_0
--->  Deactivating py27-pexpect @4.2.1_0
--->  Uninstalling py27-pexpect @4.2.1_0
--->  Deactivating py35-wcwidth @0.1.7_0
--->  Uninstalling py35-wcwidth @0.1.7_0
--->  Deactivating py35-traitlets @4.3.2_0
--->  Uninstalling py35-traitlets @4.3.2_0
--->  Deactivating py35-decorator @4.0.11_0
--->  Uninstalling py35-decorator @4.0.11_0
--->  Deactivating py35-yaml @3.12_0
--->  Uninstalling py35-yaml @3.12_0
--->  Deactivating py27-packaging @16.8_0
--->  Uninstalling py27-packaging @16.8_0
--->  Deactivating py36-ipython @6.0.0_0
--->  Uninstalling py36-ipython @6.0.0_0
--->  Deactivating py36-prompt_toolkit @1.0.9_0
--->  Uninstalling py36-prompt_toolkit @1.0.9_0
--->  Deactivating py36-pygments @2.2.0_0
--->  Uninstalling py36-pygments @2.2.0_0
--->  Deactivating py35-appdirs @1.4.3_0
--->  Uninstalling py35-appdirs @1.4.3_0
--->  Deactivating py35-parsing @2.2.0_0
--->  Uninstalling py35-parsing @2.2.0_0
--->  Deactivating py35-ipython_genutils @0.2.0_0
--->  Uninstalling py35-ipython_genutils @0.2.0_0
--->  Deactivating py35-certifi @2017.04.17_0
--->  Uninstalling py35-certifi @2017.04.17_0
--->  Deactivating py35-jedi @0.10.2_2
--->  Uninstalling py35-jedi @0.10.2_2
--->  Deactivating py35-requests @2.14.1_0
--->  Uninstalling py35-requests @2.14.1_0
--->  Deactivating python35 @3.5.3_1
--->  Uninstalling python35 @3.5.3_1
$

Naturally, py27-packaging for example has no dependency on python35:
$ port info py27-packaging
py27-packaging @16.8 (python)

Description:          Core utilities for Python packages
Homepage:             https://pypi.python.org/pypi/packaging/

Library Dependencies: python27, py27-parsing, py27-six
Platforms:            darwin
License:              {BSD Apache-2}
Maintainers:          none


Version info:
$ port version
Version: 2.4.1
$ uname -a
Darwin me.local 15.6.0 Darwin Kernel Version 15.6.0: Fri Feb 17 10:21:18
PST 2017; root:xnu-3248.60.11.4.1~1/RELEASE_X86_64 x86_64


Regards
Alex
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