Cutting slices
avi.e.gross at gmail.com
avi.e.gross at gmail.com
Sun Mar 5 23:01:52 EST 2023
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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