I don't quite understand you. So you want to build a house without bricks, stones, cements, and other basic things you must have if you need to make a practically usable home? Or what?
Anyway, if I understood you right, you can create an empty list & then append:
grades = []
and then, using the appropriate loop for you, you would then do:
[/code]grades.append()[/code]
Or you could use the array (I'm assuming you'll have float values here)
from array import array
grades = array('f')
print "Enter grades below(Once finished, enter N)"
while True:
grade = raw_input()
if grade == 'N' or grade == 'n':
break;
grades.append(int(grade))
for grade in grades:
print grade
Btw, I'm not the good python coder so others might have something to contribute in this. & Sorry if I misunderstood your question (Its not quite understandable)