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classification
Title: Diagram issue
Type: Stage:
Components: Documentation Versions:
process
Status: closed Resolution: not a bug
Dependencies: Superseder:
Assigned To: docs@python Nosy List: Eric.Fulton, docs@python, georg.brandl
Priority: normal Keywords:

Created on 2014-10-04 16:00 by Eric.Fulton, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (2)
msg228464 - (view) Author: Eric Fulton (Eric.Fulton) Date: 2014-10-04 16:00
I believe the diagram showing how slices works from https://docs.python.org/2/tutorial/introduction.html is incorrect.  There should be no 6.  

>>> word = 'Python'
>>> word[6]
IndexError: string index out of range


Original:
 +---+---+---+---+---+---+
 | P | y | t | h | o | n |
 +---+---+---+---+---+---+
 0   1   2   3   4   5   6
-6  -5  -4  -3  -2  -1

What it should be:
 +---+---+---+---+---+---+
 | P | y | t | h | o | n |
 +---+---+---+---+---+---+
 0   1   2   3   4   5   
-6  -5  -4  -3  -2  -1


--------------------------

One way to remember how slices work is to think of the indices as pointing between characters, with the left edge of the first character numbered 0. Then the right edge of the last character of a string of n characters has index n, for example:

 +---+---+---+---+---+---+
 | P | y | t | h | o | n |
 +---+---+---+---+---+---+
 0   1   2   3   4   5   6
-6  -5  -4  -3  -2  -1
msg228465 - (view) Author: Georg Brandl (georg.brandl) * (Python committer) Date: 2014-10-04 16:05
Hi Eric,

this paragraph is about slices, where you *can* do

>>> word[0:6]
'Python'

As such, the paragraph is correct.
History
Date User Action Args
2022-04-11 14:58:08adminsetgithub: 66743
2014-10-04 16:05:33georg.brandlsetstatus: open -> closed

nosy: + georg.brandl
messages: + msg228465

resolution: not a bug
2014-10-04 16:00:47Eric.Fultoncreate