how to insert characters in defined places in a python string?

Question

what is the pythonic efficient way to insert a character every n-characters in a string? for example

ins("aabbccdd", 2, "-") => "aa-bb-cc-dd"

is there a way to do this with iterators?

possible duplicate of [Pythonic way to insert every 2 elements in a string](http://stackoverflow.com/questions/3258573/pythonic-way-to-insert-every-2-elements-in-a-string) — l'L'l, Mar 02 '15 at 03:34

score 4 · Accepted Answer · answered Mar 02 '15 at 03:31

4

You can str.join i length chunks of s:

s = "aabbccdd"
i = 2
print("-".join([s[j:j+i] for j in range(0,len(s),i)]))
aa-bb-cc-dd

answered Mar 02 '15 at 03:31

1

`'-'.join(s[i:i+2] for i in range(0, len(s), 2))` can eliminate the `i = 2`. – l'L'l Mar 02 '15 at 03:39
@I'L'I I used i so the OP can choose the chunk size – Padraic Cunningham Mar 02 '15 at 10:00

1 Answers1