How to run a python script with functions

[faiz.lotfy at gmail.com]

Hi

I have a file with a python scripts that has many functions in it. To run the script I did the following:
1. $ python (to initiate python, using the python command)
2. >>> import file_name (without .py)
3. >>> file_name.function_name(argument) (to run the function_name with argument (argument)

My question is: Is there any other way that I can just use the function name (function_name) without having to use the file_name. part? That is, use only:
>>> function_name(argument)

~faizlo