python - is it possible to change working directory when executing a .py file in different folder? -

for example,here directory tree:

+--- test.py | +--- [subdir]       |       +--- another.py 

test.py:

import os os.system('python subdir/another.py') 

another.py:

import os os.mkdir('whatever') 

after running test.py ,i expected have folder whatever in subdir,but got is:

+--- test.py | +--- [subdir] |     | |     +--- another.py | +--- whatever 

the reason quite obvious:working directory hadn't been changed subdir.so possible change working directory when executing .py file in different folder? note:

1. any function allowed, os.system example
2. os.system('cd xxx') , os.chdir not allowed

edit: decide use context manager,following answer in
https://stackoverflow.com/posts/17589236/edit

import os import subprocess # call arbitrary command e.g. 'ls'  class cd:     def __init__(self, newpath):         self.newpath = newpath      def __enter__(self):         self.savedpath = os.getcwd()         os.chdir(self.newpath)      def __exit__(self, etype, value, traceback):         os.chdir(self.savedpath)  # can enter directory this: cd("~/library"):    # in ~/library    subprocess.call("ls")  # outside context manager started. 

ummm, function so: os.chdir(path).

maybe it's little bit confusing or incosistent because function obtain current working directory called os.getcwd() , has no counterpart setter. nevertheless, doc says chdir changes cwd.

in python 3.x path can valid file descriptor, while in 2.x branch fchdir(fd) must used.