Matplotlib版本在python中不正确

Question

Python说它正在使用matplotlib版本1.1.1，即使我安装了1.3.1版本。

>>> import matplotlib as mpl
>>> mpl.__version__
'1.1.1'

• Mac OS X
• Python 2.7
• 安装了MacPorts

当我使用MacPorts安装py27-matplotlib（1.3.1）时，python将其报告为版本1.1.1。当我使用sudo port uninstall py27-matplotlib删除安装了MacPorts的模块时，python仍会将其报告为使用版本1.1.1。

这个版本来自哪里，如何让python使用更新的模块？

更新 sys.path输出如下：

'',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
 '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
 '/Library/Python/2.7/site-packages'