Q:

python change starting up/default directory

I am new to python. 
Every time I start the shell, it always gives me directory as:

".../file name/Python/"

But I want to change it to: 

".../file name/python program/" 

How do I do it without changing the import modulate stuff?
I am afraid to make it wrong so that I can't import anymore, but it is so annoy to put:
import os
os.chdir(".../file name/python program/")

every time after I open the shell.
Thanks for help!

A:

Checkout:  http://docs.python.org/using/cmdline.html#envvar-PYTHONSTARTUP
This is an environment variable that can be set to a file. This is executed prior to start up of shell and only applies if you are using interactive shell.
You can use this to specify a path as current directory at start of your shell.
import os
os.chdir('/pathto')
del os 

Write to a file and point to it with env variable.
If this is just specific to a file that you are running, then you should be changing the directory inside the script
os.chdir('/pathto')

