Python 2和Python 3中sys.path中的导入和路径顺序

对于Python 2和Python 3,我还通过apt-get在/usr/lib(版本1.8.2)和本地/home/user/.local/lib(版本1.9.2)中安装了numpy系统.

我得到以下结果：

Python 2.7

>>> print('n'.join(sys.path))

/usr/lib/python2.7
/usr/lib/python2.7/plat-x86_64-linux-gnu
/usr/lib/python2.7/lib-dynload
/home/user/.local/lib/python2.7/site-packages
/usr/local/lib/python2.7/dist-packages
/usr/lib/python2.7/dist-packages
/usr/lib/pymodules/python2.7

>>> import numpy
>>> numpy.version 
<module 'numpy.version' from  /home/user/.local/lib/python2.7/site-packages/numpy/version.pyc'>
>>> numpy.version.version
'1.9.2'

Python 3.4

>>> print('n'.join(sys.path))

/usr/lib/python3/dist-packages
/usr/lib/python3.4
/usr/lib/python3.4/plat-x86_64-linux-gnu
/usr/lib/python3.4/lib-dynload
/home/user/.local/lib/python3.4/site-packages
/usr/local/lib/python3.4/dist-packages

>>> import numpy
>>> numpy.version 
<module 'numpy.version' from '/usr/lib/python3/dist-packages/numpy/version.py'>
>>> numpy.version.version
'1.8.2'

你能帮我理解为什么Python 3 /usr/lib / python3 / dist-packages高于/home/user/.local/lib/python3.4/site-packages导致我的旧系统安装numpy被导入默认情况下,虽然它是Python 2中的另一种方式？