Creating a Null list, seems to create a null tuple instead

JimDibb

Please don't critique my algorithm as I'm a rank newbie (or go ahead, I can take it :) ). But I can't figure the following out.

shuffled_list always seems to be defined as () when I look in the debugger, so I continually get

File "C:\Python25\cards.py", line 29, in shuffle
while index:
AttributeError: 'tuple' object has no attribute 'append'

I have no idea whats wrong here.

May 4 '07 #1

Prasannaa

Hi
I am also new to python.
I tried your code, it works fine for me.
(I use Python 2.5).

Regards,
Prasannaa

May 4 '07 #2

JimDibb

Hi
I am also new to python.
I tried your code, it works fine for me.
(I use Python 2.5).

Regards,
Prasannaa

Well, interestingly, I exited Winpython, restarted it and it works for me too now. I fixed one problem in preceeding code at the same time. My C background had intruded and I had
Does anyone know what that causes? I got no errors but perhaps it messed something up in the intepreter and it couldn't recover?

Thanks!

May 4 '07 #3

bvdet

Well, interestingly, I exited Winpython, restarted it and it works for me too now. I fixed one problem in preceeding code at the same time. My C background had intruded and I had

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1. deck = [];
2.  

Does anyone know what that causes? I got no errors but perhaps it messed something up in the intepreter and it couldn't recover?

Thanks!

Since 'list()' returns '[]', I cannot explain why you had the tuple problem. Your algorithm looks fine. For the record, the random module has other functions that do basically the same thing: OR

May 4 '07 #4

JimDibb

Since 'list()' returns '[]', I cannot explain why you had the tuple problem. Your algorithm looks fine. For the record, the random module has other functions that do basically the same thing:

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1. >>> deck = range(0,52)
2. >>> random.shuffle(deck)
3. >>> deck
4. [41, 10, 23, 46, 14, 25, 5, 37, 9, 11, 3, 47, 1, 49, 22, 20, 29, 15, 51, 8, 4, 18, 17, 26, 36, 43, 34, 0, 48, 2, 50, 6, 16, 33, 28, 24, 38, 44, 35, 27, 42, 31, 7, 45, 40, 12, 13, 21, 19, 39, 32, 30]
5. >>> 

OR

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1. >>> random.sample(range(0,52), 52)
2. [10, 26, 7, 45, 46, 48, 16, 1, 34, 32, 6, 35, 30, 18, 0, 21, 49, 8, 40, 29, 4, 36, 11, 15, 42, 28, 5, 3, 25, 27, 20, 9, 43, 17, 24, 39, 22, 33, 38, 2, 47, 51, 50, 13, 12, 44, 19, 31, 37, 14, 41, 23]
3. >>> 

EXCELLENT, thanks!

May 7 '07 #5

bartonc

Well, interestingly, I exited Winpython, restarted it and it works for me too now.

I've heard of this type of old vs new namespace problem in PythonWin (never experienced it since I only used that IDE for a day or two). There are issues with import vs reload (I never use those either) IDLE's Run Module has always worked for me. Perhaps you weren't using PythonWin's Run command???

I fixed one problem in preceeding code at the same time. My C background had intruded and I had

Expand|Select|Wrap|Line Numbers

1. deck = [];
2.  

Does anyone know what that causes? I got no errors but perhaps it messed something up in the intepreter and it couldn't recover?

Thanks!

Python will create an empty list. But then, if you (or something) Python simply re-assigns the name to the new object and if that was the only reference to the empty list, it is marked for Garbage Collection.

May 7 '07 #6