Fwd: What's correct Python syntax?

[Larry Hudson]

On 01/14/2014 02:03 AM, Igor Korot wrote:
[snip]

> C:\Documents and Settings\Igor.FORDANWORK\Desktop\winpdb>python
> Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> test = "I,like,my,chocolate"
>>>> print test.split(',')[2,3]
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> TypeError: list indices must be integers, not tuple
>

Try again...  but use a colon not a comma, [2:3]

Two additional comments:
(1)  test.split(',')[2:3] will give you ["my"] only.  The slicing syntax starts with the first 
index and goes up to but NOT INCLUDING the second.  In this case it is the same as the single 
index, [2].  You want either [2:4] or [2:], or even [2:500].  Any value >= the length of the 
list (or whatever sequence) is acceptable as the ending index in a slice.  It's probably not a 
good idea to use a value like this, but it does work.  And obviously, don't try to read with an 
out-of-bounds index, but it does work as the _ending_ index in a slice.

(2)  A comma-separated list of data items IS a tuple, even without the usual enclosing 
parenthesis.  That is your error here -- [2,3] is the same as [(2,3)], which is a tuple.

      -=- Larry -=-