インストールしたバージョンのpythonが起動していなかった

Mac用のpython2.6をインストールして使っていたつもりだったけれど、実際はそうでなかった。今まで気づかなかった。python -vでバージョンが表示されるところが、エラーメッセージになっているのは気づいていたけれど。pythonと入力して出てくるバージョンを見るとやっぱりインストールがうまくできていないよう。

Terminalでpythonと入力してみると…

Python 2.3.5 (#1, Nov 26 2007, 09:23:30)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1819)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

エラーメッセージ

Terminalでpython -vと入力したときのエラーメッセージ

# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
import site # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site.pyc
import os # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/os.pyc
import posix # builtin
import posixpath # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/posixpath.pyc
import stat # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/stat.pyc
import UserDict # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/UserDict.pyc
import copy_reg # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy_reg.pyc
import types # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/types.pyc
import warnings # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/warnings.pyc
import linecache # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/linecache.pyc
import encodings # directory /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/encodings
import encodings # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/encodings/__init__.pyc
import codecs # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/codecs.pyc
import _codecs # builtin
import encodings.aliases # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/encodings/aliases.pyc
import encodings.ascii # precompiled from /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/encodings/ascii.pyc
Python 2.3.5 (#1, Nov 26 2007, 09:23:30)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1819)] on darwin
Type "help", "copyright", "credits" or "license" for more information.