Splitting a string every 'n'

[Terry Reedy]

<Simon.Foster at smiths-aerospace.com> wrote in message
news:mailman.1026219434.22644.python-list at python.org...
>
> What is the idiomatic way to split a string into a list
> containing 'n' character substrings?  I normally do
> something like:
>
> while strng:
>     substring = strng[:n]
>     strng = strng[n:]
>     <process substring>

You are asking two different questions in you text and code:
1. How generate explicit list of successie length n substrings
(slices)?
2. How process successie length n substrings (slices), (which can then
be tossed)?

Second is easier than first: both require attention to possibility of
remainder of length less than n.
...
> Any better ideas, short of manually indexing through?

What, pray tell, is wrong with doing the simple obvious thing that you
can program correctly in a minute or two?

>  Is there something like:
>
> for substring in strng.nsplit():
>     <process substring>

Note that this says that (2) rather that (1) above is your question.
For 2.2+, write a generator that manually indexes thru sequence,
returning successive slices.  A second param could determine whether a
short tail is returned or suppressed.

Terry J. Reedy