前回の話
やりたいこと
- python3.6をEC2にインストールする。
- pythonコマンドでpython3.6が動くようにする
- デフォルトは2系のpythonが動く。
前提
OS:AmazonLinux2
→python36が見つけられないので、リポジトリを追加する
epelリポジトリの追加
「ネタを探しに行く先が増やせる」くらいに思っていてくれればいい。
- コマンド
amazon-linux-extras install epel
[root@ip-10-0-1-99 yum.repos.d]# amazon-linux-extras install epel
Installing epel-release
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
Cleaning repos: amzn2-core amzn2extra-docker amzn2extra-epel
10 metadata files removed
4 sqlite files removed
0 metadata files removed
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
amzn2-core | 2.4 kB 00:00:00
amzn2extra-docker | 1.3 kB 00:00:00
amzn2extra-epel | 1.3 kB 00:00:00
(1/5): amzn2-core/2/x86_64/group_gz | 2.4 kB 00:00:00
(2/5): amzn2-core/2/x86_64/updateinfo | 122 kB 00:00:00
(3/5): amzn2extra-epel/2/x86_64/primary_db | 1.8 kB 00:00:00
(4/5): amzn2extra-docker/2/x86_64/primary_db | 56 kB 00:00:00
(5/5): amzn2-core/2/x86_64/primary_db | 31 MB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:7-11 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=====================================================================================================================================================================
Package Arch Version Repository Size
=====================================================================================================================================================================
Installing:
epel-release noarch 7-11 amzn2extra-epel 15 k
Transaction Summary
=====================================================================================================================================================================
Install 1 Package
Total download size: 15 k
Installed size: 24 k
Is this ok [y/d/N]: y
→Is this ok [y/d/N]: yでインストールされる。
python3.6をインストール
- コマンド
yum install python36
[root@ip-10-0-1-99 ~]# yum install python36
Loaded plugins: priorities, update-motd, upgrade-helper
amzn-main | 2.1 kB 00:00:00
amzn-updates | 2.5 kB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package python36.x86_64 0:3.6.8-1.13.amzn1 will be installed
--> Processing Dependency: python36-libs(x86-64) = 3.6.8-1.13.amzn1 for package: python36-3.6.8-1.13.amzn1.x86_64
--> Processing Dependency: python36-setuptools for package: python36-3.6.8-1.13.amzn1.x86_64
--> Processing Dependency: python36-pip for package: python36-3.6.8-1.13.amzn1.x86_64
--> Processing Dependency: libpython3.6m.so.1.0()(64bit) for package: python36-3.6.8-1.13.amzn1.x86_64
--> Running transaction check
---> Package python36-libs.x86_64 0:3.6.8-1.13.amzn1 will be installed
---> Package python36-pip.noarch 0:9.0.3-1.26.amzn1 will be installed
---> Package python36-setuptools.noarch 0:36.2.7-1.33.amzn1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=====================================================================================================================================================================
Package Arch Version Repository Size
=====================================================================================================================================================================
Installing:
python36 x86_64 3.6.8-1.13.amzn1 amzn-updates 65 k
Installing for dependencies:
python36-libs x86_64 3.6.8-1.13.amzn1 amzn-updates 12 M
python36-pip noarch 9.0.3-1.26.amzn1 amzn-updates 2.7 M
python36-setuptools noarch 36.2.7-1.33.amzn1 amzn-main 831 k
Transaction Summary
=====================================================================================================================================================================
Install 1 Package (+3 Dependent packages)
Total download size: 15 M
Installed size: 48 M
Is this ok [y/d/N]: y
Downloading packages:
(1/4): python36-3.6.8-1.13.amzn1.x86_64.rpm | 65 kB 00:00:00
(2/4): python36-setuptools-36.2.7-1.33.amzn1.noarch.rpm | 831 kB 00:00:00
(3/4): python36-pip-9.0.3-1.26.amzn1.noarch.rpm | 2.7 MB 00:00:00
(4/4): python36-libs-3.6.8-1.13.amzn1.x86_64.rpm | 12 MB 00:00:01
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 8.2 MB/s | 15 MB 00:00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : python36-libs-3.6.8-1.13.amzn1.x86_64 1/4
Installing : python36-3.6.8-1.13.amzn1.x86_64 2/4
Installing : python36-setuptools-36.2.7-1.33.amzn1.noarch 3/4
Installing : python36-pip-9.0.3-1.26.amzn1.noarch 4/4
Verifying : python36-setuptools-36.2.7-1.33.amzn1.noarch 1/4
Verifying : python36-libs-3.6.8-1.13.amzn1.x86_64 2/4
Verifying : python36-3.6.8-1.13.amzn1.x86_64 3/4
Verifying : python36-pip-9.0.3-1.26.amzn1.noarch 4/4
Installed:
python36.x86_64 0:3.6.8-1.13.amzn1
Dependency Installed:
python36-libs.x86_64 0:3.6.8-1.13.amzn1 python36-pip.noarch 0:9.0.3-1.26.amzn1 python36-setuptools.noarch 0:36.2.7-1.33.amzn1
Complete!
普通にコンプリートするはず。
pythonコマンドのpythonが3系で動くようにする
まずは単純にpython --versionを叩いてみる
[root@ip-10-0-1-99 ~]# python --version
Python 2.7.16
→2系のpythonと言われた
続けて、何も考えずpython3 --versionを叩いてみる
[root@ip-10-0-1-99 ~]# python3 --version
Python 3.6.8
→3系のpythonと言われた
3系のpythonはpython3で動いてくれる。
→ということで、pythonにpython3を紐づけてあげればいい。
aliasで紐づける
何も考えずこのコマンドを叩いてみる
alias = python="python3"
もう一度python --versionを叩いてみる
[root@ip-10-0-1-99 ~]# alias python="python3"
[root@ip-10-0-1-99 ~]#
[root@ip-10-0-1-99 ~]# python --version
Python 3.6.8
→3系のpythonとして反応してくれた
→つまり、aliasで紐づけると何も考えずpythonコマンドで3系pythonが使える。
aliasを.bashrcに書き込む
aliasはいいけど、欠点はログアウトしたら設定が消えてしまう。
ということで、.bashrcに書き込んで、ログインするたびにaliasの設定を自動でやってもらう。
サクッと下記コマンドを叩く
vim ~/.bashrc
# .bashrc
# User specific aliases and functions
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
alias python="python3"
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
alias python="python3"を追記して保存する。
コンソールで下記を叩く
. .bashrc
もう1回python --versionを実行する
[root@ip-10-0-1-99 ~]# . .bashrc
[root@ip-10-0-1-99 ~]#
[root@ip-10-0-1-99 ~]# python --version
Python 3.6.8
無事に3系pythonで動いてくれた。
以上。