What does python pythonpath mean?

Pythonpath is an important environment variable in Python. It is used to search for paths when importing modules. By accessing Pythonpath, you can see that the first element of the path list is an empty string, which represents a relative path. the current directory under.

Pythonpath is an important environment variable in Python, used to search for paths when importing modules. This article will tell you how to access it.

Can be accessed in the following ways:

>>> import sys
>>> sys.path
['', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', 
'/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PILcompat', 
'/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7',
 '/usr/lib/python2.7/dist-packages/ubuntu-sso-client']

As you can see, the first element of the path list is an empty string, which represents the current directory under a relative path.

Since when importing a module, the interpreter will search in the order of the list until it finds the first module, so the modules imported first are modules in the same directory.

When importing modules The order of search paths can also be changed. There are two situations here:

1, changed through sys.path.append(), sys.path.insert() and other methods. This method will be interpreted when restarting When the server is installed, the original settings will become invalid.

2. Change PYTHONPATH. This setting method is permanently effective:

In this case, you can pass the path displayed in the sys.path list Add a .pth file to achieve this.

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