Cutting slices

[avi.e.gross at gmail.com]

I am not commenting on the technique or why it is chosen just the part where
the last search looks for a non-existent period:

s = 'alpha.beta.gamma'
...
s[ 11: s.find( '.', 11 )]

What should "find" do if it hits the end of a string without finding the
period you claim is a divider?

Could that be why gamma got truncated?

Unless you can arrange for a terminal period, maybe you can reconsider the
approach.


-----Original Message-----
From: Python-list <python-list-bounces+avi.e.gross=gmail.com at python.org> On
Behalf Of aapost
Sent: Sunday, March 5, 2023 6:00 PM
To: python-list at python.org
Subject: Re: Cutting slices

On 3/5/23 17:43, Stefan Ram wrote:
>    The following behaviour of Python strikes me as being a bit
>    "irregular". A user tries to chop of sections from a string,
>    but does not use "split" because the separator might become
>    more complicated so that a regular expression will be required
>    to find it. But for now, let's use a simple "find":
>    
> |>>> s = 'alpha.beta.gamma'
> |>>> s[ 0: s.find( '.', 0 )]
> |'alpha'
> |>>> s[ 6: s.find( '.', 6 )]
> |'beta'
> |>>> s[ 11: s.find( '.', 11 )]
> |'gamm'
> |>>>
> 
>    . The user always inserted the position of the previous find plus
>    one to start the next "find", so he uses "0", "6", and "11".
>    But the "a" is missing from the final "gamma"!
>    
>    And it seems that there is no numerical value at all that
>    one can use for "n" in "string[ 0: n ]" to get the whole
>    string, isn't it?
> 
> 

I would agree with 1st part of the comment.

Just noting that string[11:], string[11:None], as well as string[11:16] 
work ... as well as string[11:324242]... lol..
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