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On week 2 beginning 'Iteration', I get an error on the print statement see below http://pastebin.com/raw.php?i=sFhLznUw Any one know why ?

MIT 6.00 Intro Computer Science (OCW)
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i don't get an error what did the traceback say?
@minimallinux check your spelling. Python is case sensitive:P
File "", line 4 print (str(x) + '*' + str(x) + '=' + str(ans)) ^ SyntaxError: invalid syntax >>>

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Other answers:

itersleft = itersLeft - 1 << wrong spelling
Fixed that still error x = 3 >>> ans = 0 >>> itersLeft = x >>> while (itersLeft != 0): ... ans = ans + x ... itersLeft = itersLeft - 1 ... print (str(x) + '*' + str(x) + '=' + str(ans)) File "", line 4 print (str(x) + '*' + str(x) + '=' + str(ans))
print (str(x) + '*' + str(x) + '=' + str(ans)) >>>>> print(str(x) + '*' + str(x) + '=' + str(ans)) might be this too (the space betweent print and parenthesis)
between*
Does't seem to be a problem on other print statements, seem to get error whichever way I try it, even copy paste original code !
ie. the file I download produces error
hmm let me see again
i just saw ...are u doing it in IDLE or on a new file? i mean for me even without touching the print statement it runs properly.
>>> while (itersLeft != 0): ... ans = ans + x ... itersLeft = itersLeft - 1 ... print (str(x) + '*' + str(x) + '=' + str(ans)) thats too much for IDLE i think...i believe u are supposed to write that long code into the other python window and then run the whole from there. i wrote the code in the IDLE and it gives me the same error it gives u.BUT, if i write it into the code window(or help me here how it is called) it works fine.
No I don't use idle just standard python shell
ok w8 i confused the python windows names. i wanted to say that ,when i used the shell it gave me error....but if u use [File>>>New Window] and write it there it runs normally.
I've got 2.6 and 3.3 and both show error
did u do it like i told u? on shell window go file>>>New Window then write ur code there and press f5 (to run it).
Ill try
same in idle, error in syntax even with the original file
Getting a little baffling
hmm dont know how to help u :( works fine for me...could u pass some screens maybe somehow?
Yes I will attach a screenshot if possible
Using what I see here, if I duplicate it I can get the same error in the python shell unless I hit again before the print so the ... changes to >>> Can't duplicate error in idle. x = 3 >>> ans = 0 >>> itersLeft = x >>> while (itersLeft != 0): ... ans = ans + x ... itersLeft = itersLeft - 1 ... print (str(x) + '*' + str(x) + '=' + str(ans)) File "", line 4 print (str(x) + '*' + str(x) + '=' + str(ans))
So I have attached iterate.jpg, a screenshot of my python shell running the code to an error
1 Attachment
minima btw do u use the suggested version of python? i mean might that be the problem? http://www.enthought.com/products/epd_free.php
I have both 2.6 and 3.3
I prefer just the shell, it should work
suggested is 2.7 and in the screen u r using shell (i think) not the window i told u to try.
As above I can duplicate what your image shows but hitting again like I said makes it work
Yes just the shell but it SHOULD work
OK Ill hit twice
xD tell us what happens when u hot twice:P
No I get the error even then
It must be something simple
when i paste thsi into shell: x = 3 ans = 0 itersLeft = x while (itersLeft != 0): ans = ans + x itersLeft = itersLeft - 1 print(str(x) + '*' + str(x) + '=' + str(ans)) i get no error...but i dont get any answer either:P thats crazy xD
if i try to write command per command it gives me the error
good idea:)
@msmithhnova ok i now got what u meant by enter twice yes it works for me aswell now.
no i believe u just didnt do what msmith says. before u write the print statment enter wtice so u ge the >>> then write the print statement.
Yeah the way I look at that is since you didn't hit enter again to exit the while loop code it thinks it is still in the while loop but then it gets to the print which is not indented and realizes it isn't. So now it goes "ok i am in the loop but i'm not in the loop, huh" , throws it's virtual hands up in the air and says "I give up" (syntax error)
hahhahah poor code!!!
... yes, you need to enter the print statement at a shell prompt you haven't let the interpreter execute the while statement/suite and it doesn't like that at all. the shell lets you enter multiline compound statements but if you try to include something 'outside' of the compund statement it will complain http://dpaste.com/810233/
did you see my code paste?
the problem is definitely an indentation problem. you have entered a multiline compound statement into the shell the print statement has been entered before the shell can process the compound statement BUT the print statement indentation places it outside of the compound statements execution suite the shell doesn't like this so it complains. try typing all that into a text file and running the file/module/script from the shell - do linux files need an extension (.py)?
Sorry folks, it is not suspect i just got it working by running it as a file in normal shell (the equivalent of running in idle) as opposed to typing into a python shell here is my result [anton@Centos ~]$ python iterstest.py 3*3 = 9 So sorry for the accusations, recriminations and the loss of around 3 hours !
bwCA is right
I can put 3.3 back on now
yeay - i don't bother much with the command prompt shell so i had to try it for myself
1 Attachment
I'm not keen on the idle so I will run them as file in shell
So we have to be careful of typing into shell with multiline statements
yep the shell only executes one 'statement' at a time. it recognizes compound statements and allows you to enter the multiple lines it (apparently) recognizes that you are done with the compound statement when you enter a blank line - then executes it if you mess up and enter two separate statements it identifies it as a syntax error don't stop using the shell tho, it is a great way to try things out and see if they work. now you know about compound statements in the shell so keep using it. when you are writing a program in a file and having trouble with it, the shell is a great place to try bits and pieces of it to narrow down the problem - often you can write simplified versions of your code in the shell to test out structure or logic and it is very convenient
And my equivalent of idle is to put it in a .py file and run it with the python command

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