python導入模塊路徑優先級問題

優先級只需要

import sys

print sys.path

就可以看到，優先級是按照從前向後排列的

' '代表腳本當前位置，import優先級是最高的，其次是方法1設置的PYTHONPATH

>>> import sys
>>> print sys.path
['', '/home/www/oadata.xesv5.com', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7', '/usr/local/lib/python2.7/plat-linux2', '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', '/usr/local/lib/python2.7/lib-dynload', '/home/dev/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/site-packages', '/home/dev/data/common_search', '/usr/local/lib/python2.7/site-packages/setuptools-33.1.1-py2.7.egg', '/usr/local/lib/python2.7/site-packages/pip-19.0.1-py2.7.egg']

注意在不同的優先級如果有相同的導入模塊，那麼只有最高優先級的模塊起作用！

方法1 這個優先級是最高的

vim /etc/profile
export PYTHONPATH=/home/www/oadata.xesv5.com
source /etc/profile #每個打開的shell界面都要source起作用

方法2

import sys
sys.path.insert(0,'/home/dev/data')
reload(sys) #加不加都起作用

>>> import sys
>>> print sys.path
['', '/home/www/oadata.xesv5.com', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7', '/usr/local/lib/python2.7/plat-linux2', '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', '/usr/local/lib/python2.7/lib-dynload', '/home/dev/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/site-packages', '/home/dev/data/common_search', '/usr/local/lib/python2.7/site-packages/setuptools-33.1.1-py2.7.egg', '/usr/local/lib/python2.7/site-packages/pip-19.0.1-py2.7.egg']
>>> sys.path.insert(0,'/home/dev/data')
>>> print sys.path
['/home/dev/data', '', '/home/www/oadata.xesv5.com', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7', '/usr/local/lib/python2.7/plat-linux2', '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', '/usr/local/lib/python2.7/lib-dynload', '/home/dev/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/site-packages', '/home/dev/data/common_search', '/usr/local/lib/python2.7/site-packages/setuptools-33.1.1-py2.7.egg', '/usr/local/lib/python2.7/site-packages/pip-19.0.1-py2.7.egg']

可以看到'/home/dev/data' 排在了當前位置 ‘ ’的前面，但是隻在當前運行腳本起作用

方法3

import sys
sys.path.append('/home/dev/data2')

append 是按照數組順序添加在最後面，優先級最低