[Python] Change directory in terminal using python

I'm writing a simple script to change the present working directory to some other directory. The following script works okay until the program terminates, after which I'm back to my home directory.

#!/usr/bin/python

import os

if __name__ == '__main__':
os.chdir("/home/name/projects/python")
os.system("pwd")
print 'dir changed'


Output is:

bash:~$ python chdir.py
/home/name/projects/python
dir changed
bash:~$ pwd
/home/name


I want the directory change to remain even after the program has exited. Any ideas how to do it?

Edit: What I really want to do is this: I use this directory frequently and instead of doing cd <path> every time I open the terminal, I just write ./progname and it changes the directory.

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