packaging Python files

[Rajarshi Guha]

Hi,
  sometimes when I write Python code I'll split up the code into several
files and import the modules when I need them. I know that when
deploying the program I can place everyhting into a directory under
PYTHONPATH and it should run. 

However, I was wondering whether there was any framework to create a
single Python file that would contain all the required files of the
project so that a user would simply run the file. Is this a good idea?
Has it been implemented?

Thanks,