Ah I see! Thank your everyone for the clarification. The pictures really help, thank you. =]
Here is a picture of my ball python.* I feed it one adult mouse once a week...but since I can't weight it (I am financially dependent and my snake budget is $0 right now; unless I have to buy food) I am unsure if one adult mouse is "enough." Can I have some opinions?

*<cough/> How exactly do I upload a photo?