Normally you can execute a Python script for example: python myscript.py, but if you are in the interactive mode, how is it possible to execute a Python script
import file without the .py extension will do it, however __name__ will not be "__main__" so if the script does any checks to see if it's being run interactively you'll need to bypass them.
Alternately, if you're wanting to have a look at the environment after the script runs try python -i script.py
EDIT: To load it again
file = reload(file)