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minimallinux

  • 2 years ago

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 ?

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  1. bwCA
    • 2 years ago
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    i don't get an error what did the traceback say?

  2. MicroBot
    • 2 years ago
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    @minimallinux check your spelling. Python is case sensitive:P

  3. minimallinux
    • 2 years ago
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    File "<stdin>", line 4 print (str(x) + '*' + str(x) + '=' + str(ans)) ^ SyntaxError: invalid syntax >>>

  4. MicroBot
    • 2 years ago
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    itersleft = itersLeft - 1 << wrong spelling

  5. minimallinux
    • 2 years ago
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    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 "<stdin>", line 4 print (str(x) + '*' + str(x) + '=' + str(ans))

  6. MicroBot
    • 2 years ago
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    print (str(x) + '*' + str(x) + '=' + str(ans)) >>>>> print(str(x) + '*' + str(x) + '=' + str(ans)) might be this too (the space betweent print and parenthesis)

  7. MicroBot
    • 2 years ago
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    between*

  8. minimallinux
    • 2 years ago
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    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 !

  9. minimallinux
    • 2 years ago
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    ie. the file I download produces error

  10. MicroBot
    • 2 years ago
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    hmm let me see again

  11. MicroBot
    • 2 years ago
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    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.

  12. MicroBot
    • 2 years ago
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    >>> 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.

  13. minimallinux
    • 2 years ago
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    No I don't use idle just standard python shell

  14. MicroBot
    • 2 years ago
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    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.

  15. minimallinux
    • 2 years ago
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    I've got 2.6 and 3.3 and both show error

  16. MicroBot
    • 2 years ago
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    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).

  17. minimallinux
    • 2 years ago
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    Ill try

  18. minimallinux
    • 2 years ago
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    same in idle, error in syntax even with the original file

  19. minimallinux
    • 2 years ago
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    Getting a little baffling

  20. MicroBot
    • 2 years ago
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    hmm dont know how to help u :( works fine for me...could u pass some screens maybe somehow?

  21. minimallinux
    • 2 years ago
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    Yes I will attach a screenshot if possible

  22. msmithhnova
    • 2 years ago
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    Using what I see here, if I duplicate it I can get the same error in the python shell unless I hit <enter> 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 "<stdin>", line 4 print (str(x) + '*' + str(x) + '=' + str(ans))

  23. minimallinux
    • 2 years ago
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    So I have attached iterate.jpg, a screenshot of my python shell running the code to an error

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  24. MicroBot
    • 2 years ago
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    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

  25. minimallinux
    • 2 years ago
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    I have both 2.6 and 3.3

  26. minimallinux
    • 2 years ago
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    I prefer just the shell, it should work

  27. MicroBot
    • 2 years ago
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    suggested is 2.7 and in the screen u r using shell (i think) not the window i told u to try.

  28. msmithhnova
    • 2 years ago
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    As above I can duplicate what your image shows but hitting <enter> again like I said makes it work

  29. minimallinux
    • 2 years ago
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    Yes just the shell but it SHOULD work

  30. minimallinux
    • 2 years ago
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    OK Ill hit twice

  31. MicroBot
    • 2 years ago
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    xD tell us what happens when u hot twice:P

  32. minimallinux
    • 2 years ago
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    No I get the error even then

  33. minimallinux
    • 2 years ago
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    It must be something simple

  34. MicroBot
    • 2 years ago
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    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

  35. MicroBot
    • 2 years ago
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    if i try to write command per command it gives me the error

  36. MicroBot
    • 2 years ago
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    good idea:)

  37. MicroBot
    • 2 years ago
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    @msmithhnova ok i now got what u meant by enter twice yes it works for me aswell now.

  38. MicroBot
    • 2 years ago
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    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.

  39. msmithhnova
    • 2 years ago
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    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)

  40. MicroBot
    • 2 years ago
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    hahhahah poor code!!!

  41. bwCA
    • 2 years ago
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    ... 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/

  42. bwCA
    • 2 years ago
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    did you see my code paste?

  43. bwCA
    • 2 years ago
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    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)?

  44. minimallinux
    • 2 years ago
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    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 !

  45. minimallinux
    • 2 years ago
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    bwCA is right

  46. minimallinux
    • 2 years ago
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    I can put 3.3 back on now

  47. bwCA
    • 2 years ago
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    yeay - i don't bother much with the command prompt shell so i had to try it for myself

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  48. minimallinux
    • 2 years ago
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    I'm not keen on the idle so I will run them as file in shell

  49. minimallinux
    • 2 years ago
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    So we have to be careful of typing into shell with multiline statements

  50. bwCA
    • 2 years ago
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    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

  51. minimallinux
    • 2 years ago
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    And my equivalent of idle is to put it in a .py file and run it with the python command

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