Variable Assignment in a loop as well creating a list..

[jlandry287]

a=raw_input('Enter the number of course you are taking: ')
b=int(a)
c=range(b)
if int(a) <= 0:
      print ('Error: You must have at least one class!')
d=('Enter the course *NAME*, *CREDITS*, and *GRADE*: ')
#
for i in range(b):
    locals()["k"+str(i)]=locals()["y"+str(i)]=raw_input(d)

That is the code I have so far. I am looking for an easier way to do this, as i have to calculate GPA from the user input.

What i need to do:
*be able to extract the grade and credits from a list, therefor be able to make ANOTHER loop for the variables
ex:
if b==1:
print y0
elif b==2:
print y0
print y1

[bvdet]

I would compile a list of user input and iterate over the list to calculate the GPA. The following uses a list comprehension (untested):

data = ()
for i in range(b):
    data.append([raw_input("Enter name, credits and grade separated by commas").split(",")])

GPA = sum([int(item[2]) for item in data])/float(b)