[Tutor] a little loop

[Tim Hanson]

Okay, so I made it to FOR loops in the Lutz book.  A couple of days ago I was 
helped here with the .join method for creating strings from lists or tuples of 
strings.  I got to wondering if I could just, for the sake of learning, do the 
same thing in a FOR loop, since that's today's chapter:

x=0; ham=''; b=['s','p','a','m'] #or, b=('s','p','a','m')
for t in b:
	ham=ham+b[x]
	print(ham);x+=1

	
s
sp
spa
spam

Alright, it works, eventually.  Can someone help me find a little more elegant 
way of doing this?  I'm sure there are several.

Incidentally, I put the print statement within the FOR loop so I could watch 
progress.