How to move to one folder back in python

Question

Actually need to go some path and execute some command and below is the code

code:

import os present_working_directory = '/home/Desktop/folder'  

presently i am in folder

if some_condition == true :     change_path = "nodes/hellofolder"     os.chdir(change_path)     print os.getcwd() if another_condition  == true:     change_another_path = "nodes"      os.chdir(change_another_path)      print os.getcwd()  **Result**: '/home/Desktop/folder/nodes/hellofolder' python: [Errno 1] No such file or directory 

Actually whats happening here is when i first used os.chdir() the directory has changed to

'/home/Desktop/folder/nodes/hellofolder',

but for the second one i need to run a file by moving to one folder back that is

'/home/Desktop/folder/nodes' 

So can anyone let me how to move one folder back in python

Answer 1

Just like you would in the shell.

os.chdir("../nodes") 

Answer 2

Here is a very platform independent way to do it.

In [1]: os.getcwd() Out[1]: '/Users/user/Dropbox/temp'  In [2]: os.path.normpath(os.getcwd() + os.sep + os.pardir) Out[2]: '/Users/user/Dropbox/' 

Then you have the path, and you can chdir or whatever with it.