About sys.path.insert

>>> sys.path
['', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-aarch64-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/gtk-2.0']
>>> sys.path.insert(0,/home/nvidia/)
  File "<stdin>", line 1
    sys.path.insert(0,/home/nvidia/)
                      ^
SyntaxError: invalid syntax
>>> sys.path.insert(0,'/home/nvidia/')
>>> sys.path
['/home/nvidia/', '', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-aarch64-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/gtk-2.0']
>>> sys.path.insert(1,'/home/nvidia/')
>>> sys.path
['/home/nvidia/', '/home/nvidia/', '', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-aarch64-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/gtk-2.0']
>>>

由于sys.path是全局搜索路列表list,list具有insert方法，原型是insert(i, x)

i表示位置

x表示数据

意思是把数据x插入到位置i中