How do I have a Python script that can accept user input (assuming this is possible) and how do I make it read in arguments if run from the command line?
To read user input you can try the cmd module for easily creating a mini-command line interpreter (with help texts and autocompletion) and raw_input for less fancy stuff (just reading a line of text from the user).
Command line inputs are in sys.argv. Try this in your script for Python 2:
import sys print sys.argv
For Python 3:
import sys print(sys.argv)
Since print has changed from a keyword in Python 2 into a function call in Python 3.