Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
web die
714 PointsFor loop sum = 0 i = 0 for i in range(10): sum = sum + i print sum
Can you pls explain me what is happing in this loop
web die
714 Pointssum = 0
i = 0
for i in range(10):
sum = sum + I
print sum
1 Answer
Steven Parker
231,275 PointsI'm guessing you meant to write little "i" instead of capital "I", and forgot to put the parentheses around the argument to "print". So here's a corrected version with comments:
sum = 0 # start with "sum" at 0
i = 0 # and "i" at 0
for i in range(10): # make "i" go from 0 to 9 while doing the rest
sum = sum + i # increase "sum" by the value of "i"
print(sum) # print out what "sum" is at each step
So the loop will repeat 10 times, the first time "sum" and "i" will both be 0 so it will print "0". The next time 0 + 1 will be "1", then 1 + 2 will be "3", and so on.
You should see these 10 outputs while it runs: 0, 1, 3, 6, 10, 15, 21, 28, 36, 45.
web die
714 PointsThanks a million.
Steven Parker
231,275 PointsSteven Parker
231,275 PointsIt's hard to tell what the code is doing without the punctuation and indentation.
Use the instructions for code formatting in the Markdown Cheatsheet pop-up below the "Add an Answer" area.
 Or watch this video on code formatting.