Python gets the correct method for the directory where the script is located

C:test  [dir] getpath    [file] path.py    [dir]  sub      [file] sub_path.py

Like what

There is also a directory named sub under the C:\test directory;

C:\test directory under the Getpath.py,sub directory has sub_path.py,getpath.py call sub_path.py;

We execute getpath.py under the C:\test. If we use sys.path[0 in sub_path.py, we actually get the directory path "C:\test" where the getpath.py is located, because the Python virtual machine is executed from the beginning of the getpath.py. If you want to get the path to the sub_path.py, you get this:
Os.path.split (Os.path.realpath (__file__)) [0]

Verify:

Then we execute the python getpath/path.py below the C:\test, at which point the values corresponding to each usage in sub_path.py are actually:
OS.GETCWD () "C:\test", which takes the starting execution directory
Sys.path[0] or sys.argv[0] "C:\test\getpath", which is the directory where the script was executed initially
Os.path.split (Os.path.realpath (__file__)) [0] "C:\test\getpath\sub", which is the directory where __file__ files sub_path.py

