クリーンインストールしてざっと見てました。あまり詳細知らないのでバックグラウンド知ってたら是非教えてください。
13:13@debian9 ~$ python --version
Python 2.7.13
13:13@debian9 ~$ python3 --version
Python 3.5.3
$ dpkg -l | grep python
ii dh-python 2.20170125 all Debian helper tools for packaging Python libraries and applications
ii libpython-stdlib:amd64 2.7.13-2 amd64 interactive high-level object-oriented language (default python version)
ii libpython2.7:amd64 2.7.13-2 amd64 Shared Python runtime library (version 2.7)
ii libpython2.7-minimal:amd64 2.7.13-2 amd64 Minimal subset of the Python language (version 2.7)
ii libpython2.7-stdlib:amd64 2.7.13-2 amd64 Interactive high-level object-oriented language (standard library, version 2.7)
ii libpython3-stdlib:amd64 3.5.3-1 amd64 interactive high-level object-oriented language (default python3 version)
ii libpython3.5-minimal:amd64 3.5.3-1 amd64 Minimal subset of the Python language (version 3.5)
ii libpython3.5-stdlib:amd64 3.5.3-1 amd64 Interactive high-level object-oriented language (standard library, version 3.5)
ii python 2.7.13-2 amd64 interactive high-level object-oriented language (default version)
ii python-apt-common 1.4.0~beta3 all Python interface to libapt-pkg (locales)
ii python-minimal 2.7.13-2 amd64 minimal subset of the Python language (default version)
ii python2.7 2.7.13-2 amd64 Interactive high-level object-oriented language (version 2.7)
ii python2.7-minimal 2.7.13-2 amd64 Minimal subset of the Python language (version 2.7)
ii python3 3.5.3-1 amd64 interactive high-level object-oriented language (default python3 version)
ii python3-apt 1.4.0~beta3 amd64 Python 3 interface to libapt-pkg
ii python3-chardet 2.3.0-2 all universal character encoding detector for Python3
ii python3-debian 0.1.30 all Python 3 modules to work with Debian-related data formats
ii python3-debianbts 2.6.1 all Python interface to Debian's Bug Tracking System
ii python3-httplib2 0.9.2+dfsg-1 all comprehensive HTTP client library written for Python3
ii python3-minimal 3.5.3-1 amd64 minimal subset of the Python language (default python3 version)
ii python3-pkg-resources 33.1.1-1 all Package Discovery and Resource Access using pkg_resources
ii python3-pycurl 7.43.0-2 amd64 Python bindings to libcurl (Python 3)
ii python3-pysimplesoap 1.16-2 all simple and lightweight SOAP Library (Python 3)
ii python3-reportbug 7.1.7 all Python modules for interacting with bug tracking systems
ii python3-requests 2.12.4-1 all elegant and simple HTTP library for Python3, built for human beings
ii python3-six 1.10.0-3 all Python 2 and 3 compatibility library (Python 3 interface)
ii python3-urllib3 1.19.1-1 all HTTP library with thread-safe connection pooling for Python3
ii python3.5 3.5.3-1 amd64 Interactive high-level object-oriented language (version 3.5)
ii python3.5-minimal 3.5.3-1 amd64 Minimal subset of the Python language (version 3.5)
Python 2.7 の方がすくなし。
$ apt-cache rdepends python2.7 --installed --recurse
python2.7
Reverse Depends:
python2.7-minimal
libpython2.7-stdlib
python2.7-minimal
libpython2.7-minimal
libpython2.7
python
python2.7-minimal
Reverse Depends:
python2.7
libpython2.7-minimal
python2.7
libpython2.7-minimal
python-minimal
libpython2.7-stdlib
Reverse Depends:
libpython2.7-minimal
python2.7
libpython-stdlib
libpython2.7-minimal
libpython2.7
libpython2.7-minimal
Reverse Depends:
libpython2.7-stdlib
python2.7-minimal
libpython2.7
Reverse Depends:
mailutils
libmailutils5
python
Reverse Depends:
python-minimal
python-minimal
python-minimal
python-minimal
Reverse Depends:
python
libpython-stdlib
Reverse Depends:
python
mailutils
Reverse Depends:
libmailutils5
Reverse Depends:
mailutils
13:13@debian9 ~$ apt show mailutils
Package: mailutils
Version: 1:3.1.1-1
Priority: optional
Section: mail
Maintainer: Jordi Mallach <jordi@debian.org>
Installed-Size: 1,059 kB
Provides: mail-reader, mailx
Depends: mailutils-common (= 1:3.1.1-1), default-mta | mail-transport-agent, guile-2.0-libs, libc6 (>= 2.14), libfribidi0 (>= 0.19.2), libgc1c2 (>= 1:7.2d), libgnutls30 (>= 3.5.0), libgsasl7 (>= 1.1), libkyotocabinet16v5 (>= 1.2.76), libldap-2.4-2 (>= 2.4.7), libmailutils5, libncurses5 (>= 6), libpam0g (>= 0.99.7.1), libpython2.7 (>= 2.7), libreadline7 (>= 6.0), libtinfo5 (>= 6), libwrap0 (>= 7.6-4~)
Suggests: mailutils-mh, mailutils-doc
Breaks: bsd-mailx (<< 8.1.2-0.20071201cvs-1), bsdmainutils (<< 8.0.6), elm-me+ (<< 2.4pl25ME+99c-3), heirloom-mailx (<< 12.3-3)
Homepage: http://www.gnu.org/software/mailutils/
Tag: interface::text-mode, mail::filters, mail::imap, mail::pop, mail::smtp,
mail::user-agent, network::client, protocol::imap, protocol::pop3,
protocol::smtp, protocol::ssl, role::program, suite::gnu,
uitoolkit::ncurses, works-with::mail
Download-Size: 573 kB
APT-Manual-Installed: no
APT-Sources: http://ftp.jp.debian.org/debian stretch/main amd64 Packages
Description: GNU mailutils utilities for handling mail
GNU Mailutils is a rich and powerful protocol-independent mail framework.
It contains a series of useful mail libraries, clients, and servers.
.
This package contains the GNU mailutils versions of dotlock, frm, from,
maidag, mail, messages, mimeview, movemail, readmsg and sieve. They are
capable of speaking POP3, IMAP, mbox, MH and Maildir.
.
dotlock -- lock mail spool files.
frm -- display From: lines.
from -- display from and subject.
maidag -- the mail delivery agent.
mail -- the standard /bin/mail interface, mail sender and reader.
messages -- count the number of messages in a mailbox.
mimeview -- display files, using mailcap mechanism.
movemail -- move messages across mailboxes.
readmsg -- extract selected messages from a mailbox.
sieve -- a mail filtering tool.
mailutils が libpython2.7 に依存している、というのが重要な依存関係なんでしょうか。消しちゃえ。
$ sudo apt remove libpython2.7-minimal
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
guile-2.0-libs libgc1c2 libgsasl7 libkyotocabinet16v5 libltdl7 liblzo2-2 libmariadbclient18 libntlm0 mailutils-common mysql-common
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
libpython2.7-minimal libpython2.7-stdlib
0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
After this operation, 11.6 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 34666 files and directories currently installed.)
Removing libpython2.7-stdlib:amd64 (2.7.13-2) ...
Removing libpython2.7-minimal:amd64 (2.7.13-2) ..
autoremoveとか色々やる
13:22@debian9 ~$ dpkg -l | grep -i python
ii dh-python 2.20170125 all Debian helper tools for packaging Python libraries and applications
ii libpython3-stdlib:amd64 3.5.3-1 amd64 interactive high-level object-oriented language (default python3 version)
ii libpython3.5-minimal:amd64 3.5.3-1 amd64 Minimal subset of the Python language (version 3.5)
ii libpython3.5-stdlib:amd64 3.5.3-1 amd64 Interactive high-level object-oriented language (standard library, version 3.5)
ii python-apt-common 1.4.0~beta3 all Python interface to libapt-pkg (locales)
ii python3 3.5.3-1 amd64 interactive high-level object-oriented language (default python3 version)
ii python3-apt 1.4.0~beta3 amd64 Python 3 interface to libapt-pkg
ii python3-chardet 2.3.0-2 all universal character encoding detector for Python3
ii python3-debian 0.1.30 all Python 3 modules to work with Debian-related data formats
ii python3-debianbts 2.6.1 all Python interface to Debian's Bug Tracking System
ii python3-httplib2 0.9.2+dfsg-1 all comprehensive HTTP client library written for Python3
ii python3-minimal 3.5.3-1 amd64 minimal subset of the Python language (default python3 version)
ii python3-pkg-resources 33.1.1-1 all Package Discovery and Resource Access using pkg_resources
ii python3-pycurl 7.43.0-2 amd64 Python bindings to libcurl (Python 3)
ii python3-pysimplesoap 1.16-2 all simple and lightweight SOAP Library (Python 3)
ii python3-reportbug 7.1.7 all Python modules for interacting with bug tracking systems
ii python3-requests 2.12.4-1 all elegant and simple HTTP library for Python3, built for human beings
ii python3-six 1.10.0-3 all Python 2 and 3 compatibility library (Python 3 interface)
ii python3-urllib3 1.19.1-1 all HTTP library with thread-safe connection pooling for Python3
ii python3.5 3.5.3-1 amd64 Interactive high-level object-oriented language (version 3.5)
ii python3.5-minimal 3.5.3-1 amd64 Minimal subset of the Python language (version 3.5)
13:23@debian9 ~$ python
zsh: command not found: python
$ apt install -s ansible
NOTE: This is only a simulation!
apt needs root privileges for real execution.
Keep also in mind that locking is deactivated,
so don't depend on the relevance to the real current situation!
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
ieee-data libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libyaml-0-2 python python-cffi-backend python-crypto python-cryptography python-enum34 python-httplib2 python-idna
python-ipaddress python-jinja2 python-kerberos python-markupsafe python-minimal python-netaddr python-paramiko python-pkg-resources python-pyasn1 python-selinux python-setuptools
python-six python-xmltodict python-yaml python2.7 python2.7-minimal
Suggested packages:
cowsay sshpass python-doc python-tk python-crypto-dbg python-crypto-doc python-cryptography-doc python-cryptography-vectors python-enum34-doc python-jinja2-doc ipython
python-netaddr-docs python-gssapi doc-base python-setuptools-doc python2.7-doc binutils binfmt-support
Recommended packages:
python-winrm
The following NEW packages will be installed:
ansible ieee-data libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libyaml-0-2 python python-cffi-backend python-crypto python-cryptography python-enum34 python-httplib2
python-idna python-ipaddress python-jinja2 python-kerberos python-markupsafe python-minimal python-netaddr python-paramiko python-pkg-resources python-pyasn1 python-selinux
python-setuptools python-six python-xmltodict python-yaml python2.7 python2.7-minimal
0 upgraded, 29 newly installed, 0 to remove and 0 not upgraded.
Inst libpython2.7-minimal (2.7.13-2 Debian:9.0/stable [amd64])
Inst python2.7-minimal (2.7.13-2 Debian:9.0/stable [amd64])
Inst python-minimal (2.7.13-2 Debian:9.0/stable [amd64])
Inst libpython2.7-stdlib (2.7.13-2 Debian:9.0/stable [amd64])
Inst python2.7 (2.7.13-2 Debian:9.0/stable [amd64])
Inst libpython-stdlib (2.7.13-2 Debian:9.0/stable [amd64])
Conf libpython2.7-minimal (2.7.13-2 Debian:9.0/stable [amd64])
Conf python2.7-minimal (2.7.13-2 Debian:9.0/stable [amd64])
Conf python-minimal (2.7.13-2 Debian:9.0/stable [amd64])
Inst python (2.7.13-2 Debian:9.0/stable [amd64])
Inst python-crypto (2.6.1-7 Debian:9.0/stable [amd64])
Inst python-markupsafe (0.23-3 Debian:9.0/stable [amd64])
Inst python-jinja2 (2.8-1 Debian:9.0/stable [all])
Inst python-cffi-backend (1.9.1-2 Debian:9.0/stable [amd64])
Inst python-enum34 (1.1.6-1 Debian:9.0/stable [all])
Inst python-idna (2.2-1 Debian:9.0/stable [all])
Inst python-ipaddress (1.0.17-1 Debian:9.0/stable [all])
Inst python-pyasn1 (0.1.9-2 Debian:9.0/stable [all])
Inst python-pkg-resources (33.1.1-1 Debian:9.0/stable [all])
Inst python-setuptools (33.1.1-1 Debian:9.0/stable [all])
Inst python-six (1.10.0-3 Debian:9.0/stable [all])
Inst python-cryptography (1.7.1-3 Debian:9.0/stable [amd64])
Inst python-paramiko (2.0.0-1 Debian:9.0/stable [all])
Inst libyaml-0-2 (0.1.7-2 Debian:9.0/stable [amd64])
Inst python-yaml (3.12-1 Debian:9.0/stable [amd64])
Inst python-httplib2 (0.9.2+dfsg-1 Debian:9.0/stable [all])
Inst ieee-data (20160613.1 Debian:9.0/stable [all])
Inst python-netaddr (0.7.18-2 Debian:9.0/stable [all])
Inst ansible (2.2.1.0-2 Debian:9.0/stable [all])
Inst python-kerberos (1.1.5-2+b2 Debian:9.0/stable [amd64])
Inst python-selinux (2.6-3+b1 Debian:9.0/stable [amd64])
Inst python-xmltodict (0.10.2-1 Debian:9.0/stable [all])
Conf libpython2.7-stdlib (2.7.13-2 Debian:9.0/stable [amd64])
Conf python2.7 (2.7.13-2 Debian:9.0/stable [amd64])
Conf libpython-stdlib (2.7.13-2 Debian:9.0/stable [amd64])
Conf python (2.7.13-2 Debian:9.0/stable [amd64])
Conf python-crypto (2.6.1-7 Debian:9.0/stable [amd64])
Conf python-markupsafe (0.23-3 Debian:9.0/stable [amd64])
Conf python-jinja2 (2.8-1 Debian:9.0/stable [all])
Conf python-cffi-backend (1.9.1-2 Debian:9.0/stable [amd64])
Conf python-enum34 (1.1.6-1 Debian:9.0/stable [all])
Conf python-idna (2.2-1 Debian:9.0/stable [all])
Conf python-ipaddress (1.0.17-1 Debian:9.0/stable [all])
Conf python-pyasn1 (0.1.9-2 Debian:9.0/stable [all])
Conf python-pkg-resources (33.1.1-1 Debian:9.0/stable [all])
Conf python-setuptools (33.1.1-1 Debian:9.0/stable [all])
Conf python-six (1.10.0-3 Debian:9.0/stable [all])
Conf python-cryptography (1.7.1-3 Debian:9.0/stable [amd64])
Conf python-paramiko (2.0.0-1 Debian:9.0/stable [all])
Conf libyaml-0-2 (0.1.7-2 Debian:9.0/stable [amd64])
Conf python-yaml (3.12-1 Debian:9.0/stable [amd64])
Conf python-httplib2 (0.9.2+dfsg-1 Debian:9.0/stable [all])
Conf ieee-data (20160613.1 Debian:9.0/stable [all])
Conf python-netaddr (0.7.18-2 Debian:9.0/stable [all])
Conf ansible (2.2.1.0-2 Debian:9.0/stable [all])
Conf python-kerberos (1.1.5-2+b2 Debian:9.0/stable [amd64])
Conf python-selinux (2.6-3+b1 Debian:9.0/stable [amd64])
Conf python-xmltodict (0.10.2-1 Debian:9.0/stable [all])
ansibleめぇええええ！ (羊の鳴き声
特に意味はありませんでしたがご参考になれば幸いです。