python搜索包的路径的实现方法

查看python搜索包的路径的实现方法：

python搜索包的路径存储在sys.path下

查看方法：

import sys

sys.path

临时添加python搜索包路径的方法：

方法1：（先进入python）

import sys

sys.path.append(‘路径')

（这种方式仅对当前python有效）

方法2：

export PYTHONPATH=路径

(这种方式对所有的python有效)

永久写入sys.path的方法：

方法1：

在已有的sys.path搜索路径下添加 .pth文件，文件内容格式为：

import site; site.addsitedir("/usr/local/lib/python2.7/site-packages")

方法2：

在home文件夹下的.bash_profile文件中添加下面一行：

export PYTHONPATH=路径

注意，启动不同的python之后sys.path的值是不同的，例如：

启动conda下的python是sys.path的值

[
'',
'/Users/zj_macbook/anaconda/lib/python27.zip',
'/Users/zj_macbook/anaconda/lib/python2.7',
'/Users/zj_macbook/anaconda/lib/python2.7/plat-darwin',
'/Users/zj_macbook/anaconda/lib/python2.7/plat-mac',
'/Users/zj_macbook/anaconda/lib/python2.7/plat-mac/lib-scriptpackages',
'/Users/zj_macbook/anaconda/lib/python2.7/lib-tk',
'/Users/zj_macbook/anaconda/lib/python2.7/lib-old',
'/Users/zj_macbook/anaconda/lib/python2.7/lib-dynload',
'/Users/zj_macbook/anaconda/lib/python2.7/site-packages',
'/Users/zj_macbook/anaconda/lib/python2.7/site-packages/Sphinx-1.4.6-py2.7.egg',
'/Users/zj_macbook/anaconda/lib/python2.7/site-packages/aeosa',
'/Users/zj_macbook/anaconda/lib/python2.7/site-packages/setuptools-27.2.0-py2.7.egg'
]

启动

/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python
的python的sys.path的值
[
'',
'/usr/local/lib/python2.7/site-packages/six-1.10.0-py2.7.egg',
'/Library/Python/2.7/site-packages/twilio-6.3.dev0-py2.7.egg',
'/Library/Python/2.7/site-packages/httplib2-0.9.2-py2.7.egg',
'/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/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',
'/Users/zj_macbook/Library/Python/2.7/lib/python/site-packages',
'/usr/local/lib/python2.7/site-packages',
'/usr/local/Cellar/numpy/1.12.0/libexec/nose/lib/python2.7/site-packages',
'/usr/local/Cellar/protobuf/3.2.0/libexec/lib/python2.7/site-packages',
'/Library/Python/2.7/site-packages',
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC'
]

来源：https://blog.csdn.net/machinezj/article/details/60137666