When using python, you will always encounter the use of path switching. For example, if you want to switch from the folder testtest.pyCall the data folderdata.txtdocument:

.
└── folder
    ├── data
    │   └── data.txt
    └── test
        └── test.py

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A method can be added under the data file__init__.pythen intest.pymiddleimport datayou can calldata.txtdocument;

Another method can use the method of python os module to operate the directory structure. Let's talk about the use of this method:

import os

print  '***Get the current directory***' 
print  os .getcwd()
 print  os .path.abspath( os .path.dirname(__file__))

print  '***Get the parent directory***' 
print  os .path.abspath( os .path.dirname( os .path.dirname(__file__)))
 print  os .path.abspath( os .path.dirname( os . getcwd()))
 print  os .path.abspath( os .path.join( os .getcwd(), ".." ))

print  '***Get the parent directory***' 
print  os .path.abspath( os .path.join( os .getcwd(), "../.." ))

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The output is:

** * Get current directory ** *
/workspace/demo/folder/test
/workspace/demo/folder/test

** * Get the parent directory ** *
/workspace/demo/folder
/workspace/demo/folder
/workspace/demo/folder

** * Get the parent directory ** *
/workspace/demo

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