My answer got rejected first time as well. Make sure you do this:

• Have the function return it's values, rather than print.
• Do not output anything else
• Call search() at the end of your script.

Hope this helps!

Sorry @leo -- close but not quite right. Here is the same reason when code is pasted in the code editor window for 4.8,4.9 and 4.12 - if the 'hidden last line' in the window is somehow deleted- then the submission fails or there are spurious error messages when in fact the function submitted could be correct Solution: everything works now. For questions > 4.8 Reset them, and then paste in only the relevant functions.

I defined some (unneeded) global variables that i wasn't reinitializing. It's possible they're calling our function on multiple different setups. Once i moved those variables into my function i was marked as being correct.

After many hours and much frustration I read this post link

and found the trick: reset the code window, then be careful to only paste the search() code. It worked for me. Hopefully it will work for you too.

I can't verify the presence of the 'hidden last line' but the above steps did the trick for me.

Also my code returns to results and I use a print search() command.

I took out and still the same problem. Does my code have to call the search () function at the end or not? Also , i inserted some functions before search()

same problem here. ( I'm defining "closed" & "opened" lists as either global or local variables and still no go). removing the comment did not do the trick either.

Hi,
I have exactly the same problems. Its very frustrating. I have checked my code against all the examples in the lecture and i get the same answers for each.

I get the same problem. Mine works python browser & development python BUT not on submit. My code is not the same as the coded "proof" but it works. This type of thing is frustrating.

I had the same problem, the code did seem to work but I still could not submit it. I have found the solution. Just a little hint: read well the instructions that are written at the beginning of the exercise. You should find something you have not done.

Good luck!

To try and rule out any issues in my code I cut down the search function to:

def search():
return [11,4,5]

I am still getting "Incorrect. You may have incorrectly defined a function."

I tried this a couple of times by pressing reset and then re-entering the code. Once when I tried it I got a message stating that my code did not work for a 7x6 matrix so this time it was accepted. However there was no obvious difference in the code that was accepted.