As You see at the 2 pics the iteration loop works well with canopy but with IDLE Python 2.7.10 says: Syntax error
Why?
Asked
Active
Viewed 574 times
-2
-
Because print with`()` is python 3+ syntax!!! – WoodChopper Oct 28 '15 at 20:18
-
1@WoodChopper adding `()` will work in Python 2.x – Wondercricket Oct 28 '15 at 20:19
-
Removing `()` this will work in 2x – WoodChopper Oct 28 '15 at 20:20
-
@WoodChopper Even with " " or ' ' It gives me the same !! – Mohammed Hany Oct 28 '15 at 20:22
-
I tried just print ('Goodbye!') and It works well but with the iteration loop Syntax error !!! wierd ! – Mohammed Hany Oct 28 '15 at 20:24
-
It would be a big improvement if you could copy and paste the text of your issue into the question, rather than only providing images – Blckknght Oct 28 '15 at 20:24
-
@Wondercricket That's not really true. Python 2's `print()` and Python 3's `print()` are totally different beasts, with the latter being a function call while the former is expanded to `print ()` (print some tuple). Needless to say this can give weird, unexpected results on Python 2, and various arguments to the Python 3 `print()` function won't work at all. Better to just `from __future__ import print_function`. – Two-Bit Alchemist Oct 28 '15 at 20:25
-
@Two-BitAlchemist You are correct, `print` in Python 2 and 3 work completely different. However it should not be the cause of the `SyntaxError` with the OP's code. – Wondercricket Oct 28 '15 at 20:28
-
@Blckknght Sorry , I'm new here It's my first question :) – Mohammed Hany Oct 28 '15 at 20:29
-
The `print` needs to be indented to the same level as the `while` – Peter Wood Oct 28 '15 at 20:32
1 Answers
3
It looks to me like IDLE was confused by how you entered multiple statements. You need to enter a blank line after the indented suite of the while loop so it knows the statement is over (and that there's not an else block attached). You'll know you've finished the statement when the >>> prompt appears again.
>>> while ...
# stuff here
# more stuff
# leave a blank line afterwards!
>>> print ('Goodbye!')
Your code would work just fine in IDLE if you put it into a module and ran the module. It's only the interactive console that has issues.
Blckknght
- 100,903
- 11
- 120
- 169
-
Thanks so much can You tell me how to make a blank line I'm just a beginner :) – Mohammed Hany Oct 28 '15 at 20:32
-
That depends on how you're entering the code. If you're typing it by hand, just press Enter twice after the last line of the loop. If you're copying and pasting from a source that has the code tightly packed together, that's tougher. You'll need to copy the statements separately, pressing Enter in between manually. – Blckknght Oct 28 '15 at 21:47
-
but then the IDLE will excute the loop before without the statement (print) I think adding else : print ('Goodbye!') would be better or do You have another way ?! – Mohammed Hany Oct 29 '15 at 06:32
-
An else statement could work, though usually you only attach one to a loop where you might or might not be `break`ing out, rather than having the condition become falsey at some point. I think the real question though is why you want the to have both the loop and the print at the end happen at the same time? They're separate statements, so you should run one then run the next one. – Blckknght Oct 29 '15 at 08:54