「Lion 10.7.2」での「Pythonの複数ヴァージョン」の確認

以前の記事、図書紹介#004：「Go言語プログラミング入門 on Google App Engine」を見ていると、Lionには複数のヴァージョンのPythonがプリンストールされている様です。

ネット上で検索するも、意外と情報がありません。常道として「man python」を眺めていると、まずプリインストールされているのは；

• Python 2.5
• Python 2.6
• Python 2.7

のようです。これのヴァージョンを直接インタプリタとして動作確認が出来る様です。

div-mm:~ u1$ python
Python 2.7.1 (r271:86832, Jun 25 2011, 05:09:01) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**10
1024
>>> exit()
div-mm:~ u1$ python2.5
Python 2.5.6 (r256:88840, Jul 31 2011, 19:30:45) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**5
32
>>> ^D
div-mm:~ u1$ python2.6
Python 2.6.7 (r267:88850, Jul 31 2011, 19:30:54) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**6+0.7
64.700000000000003
>>> ^D
div-mm:~ u1$ python2.7
Python 2.7.1 (r271:86832, Jun 25 2011, 05:09:01) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**7
128
>>> ^D
div-mm:~ u1$ 

少なくとも、ヴァージョン番号をつければ、該当するインタプリタが呼び出される様です。その他の方法でも出来るらしい；

div-mm:~ u1$ defaults write com.apple.versioner.python Version 2.5
div-mm:~ u1$ python
Python 2.5.6 (r256:88840, Jul 31 2011, 19:30:45) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**5+.6
32.600000000000001
>>> ^D
div-mm:~ u1$ python
Python 2.5.6 (r256:88840, Jul 31 2011, 19:30:45) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**5+.06
32.060000000000002
>>> ^D
div-mm:~ u1$ defaults write com.apple.versioner.python Version 2.6
div-mm:~ u1$ python
Python 2.6.7 (r267:88850, Jul 31 2011, 19:30:54) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**6+.007
64.007000000000005
>>> ^D
div-mm:~ u1$ defaults write com.apple.versioner.python Version 2.7
div-mm:~ u1$ python
Python 2.7.1 (r271:86832, Jun 25 2011, 05:09:01) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**7+.0001
128.0001
>>> ^D
div-mm:~ u1$ echo "-----------------------------"
-----------------------------
div-mm:~ u1$ export VERSIONER_PYTHON_VERSION=2.5
div-mm:~ u1$ python
Python 2.5.6 (r256:88840, Jul 31 2011, 19:30:45) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 2**5+0.6
32.600000000000001
>>> ^D
div-mm:~ u1$ 

で、実際にGAEに対応させる場合、ディフォールトでpython2.5.6をコールしたいわけである。そこで実際のコマンドを調べてみた；

div-mm:~ u1$ 
div-mm:~ u1$ which python
/usr/bin/python
div-mm:~ u1$ ll /usr/bin/py*
-rwxr-xr-x  6 root  wheel    925  9 18 15:47 /usr/bin/pydoc*
lrwxr-xr-x  1 root  wheel     74  9 18 15:47 /usr/bin/pydoc2.5@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/pydoc2.5
lrwxr-xr-x  1 root  wheel     74  9 18 15:47 /usr/bin/pydoc2.6@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/pydoc2.6
lrwxr-xr-x  1 root  wheel     74  9 18 15:47 /usr/bin/pydoc2.7@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/pydoc2.7
-rwxr-xr-x  2 root  wheel  62752  9 18 15:47 /usr/bin/python*
-rwxr-xr-x  6 root  wheel    925  9 18 15:47 /usr/bin/python-config*
lrwxr-xr-x  1 root  wheel     75  9 18 15:47 /usr/bin/python2.5@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5
lrwxr-xr-x  1 root  wheel     82  9 18 15:47 /usr/bin/python2.5-config@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5-config
lrwxr-xr-x  1 root  wheel     75  9 18 15:47 /usr/bin/python2.6@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/python2.6
lrwxr-xr-x  1 root  wheel     82  9 18 15:47 /usr/bin/python2.6-config@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/python2.6-config
lrwxr-xr-x  1 root  wheel     75  9 18 15:47 /usr/bin/python2.7@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
lrwxr-xr-x  1 root  wheel     82  9 18 15:47 /usr/bin/python2.7-config@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7-config
-rwxr-xr-x  2 root  wheel  62752  9 18 15:47 /usr/bin/pythonw*
lrwxr-xr-x  1 root  wheel     76  9 18 15:47 /usr/bin/pythonw2.5@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/pythonw2.5
lrwxr-xr-x  1 root  wheel     76  9 18 15:47 /usr/bin/pythonw2.6@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/pythonw2.6
lrwxr-xr-x  1 root  wheel     76  9 18 15:47 /usr/bin/pythonw2.7@ -> ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/pythonw2.7
div-mm:~ u1$ ll /System/Library/Frameworks/Python.framework/Versions/
total 8
drwxr-xr-x   7 root  wheel  238  9 18 15:48 2.3/
drwxr-xr-x  11 root  wheel  374 10 13 10:55 2.5/
drwxr-xr-x  11 root  wheel  374 10 13 10:55 2.6/
drwxr-xr-x  11 root  wheel  374 10  1 11:57 2.7/
lrwxr-xr-x   1 root  wheel    3  9 18 15:47 Current@ -> 2.7
div-mm:~ u1$ 

だから、少なくとも

• /System/Library/Frameworks/Python.framework/Versions/Current@ -> 2.5

とする必要がありそうだ。まだ外にも必要な設定がありそうな気がする。その後、

• How do I change the default Python version in my Mac Snow Leopard? 

という論議の最後で、Alexさんが「Apr 22 '11」のコメントで；

cd /Library/Frameworks/Python.framework/Versions
sudo rm Current
sudo ln -s /Library/Frameworks/Python.framework/Versions/3.0 Current

と指摘されている。

ーーーー このポストの履歴

1. 開始 2012-01-23 (月) 20:36
2. 追加 2012-01-25  (水) 13:19  Alexさんが「Apr 22 '11」のコメント