python hello.py hello_msg("Hello no", 3)??? Help, please!

[Carl]

This is perhaps a very simple and stupid question!

How do you run a specific function (with actual values for the parameters)
within a module from the command prompt? That is, with "python ..."

For instance, how do I run hello_msg("Hello no ", 3), which is a function
within the module hello.py, from the console?

def hello_msg(msg, num):
    print msg + str(num ** 3) +'!'
#hello_msg("Hello no ", 3) 

Carl