python environment variable PYTHONPATH

Original link: http://www.cnblogs.com/GODYCA/archive/2013/05/31/3110410.html

Python PYTHONPATH search path is, by default we import the module from PYTHONPATH will find inside.

   Use the following code can be printed PYTHONPATH:

print (os.sys.path)

   PYTHONPATH one of my items are as follows:

[
 'D:\\Python3\\workspace\\PythonLab\\src', 
 'D:\\aptana3\\plugins\\org.python.pydev_2.7.0.2012080220\\pysrc',
 'D:\\Python3\\python33.zip', 'D:\\Python3\\DLLs', 
 'D:\\Python3\\lib', 
 'D:\\Python3', 
 'D:\\Python3\\lib\\site-packages'
]

   For example, I use the following import statement:

import urllib

   Python interpreter will choose a path-by-path from the list above and then search until you find urllib module. Finally, here in the D: find \ Python3 under \ lib, as shown below:

Reproduced in: https: //www.cnblogs.com/GODYCA/archive/2013/05/31/3110410.html