Incrementing a string

Jeffrey Froman jeffrey at
Thu Sep 16 06:20:03 CEST 2004

John Velman wrote:

> $label++;
> This conveniently steps through the alphabet, then goes on to aa, ab,ac,
> ...
> In Python I can get from a to z with a generator as so:
> But it looks like going beyond z to aa and so on is (relatively)
> complicated.

Here's one way, perhaps it is simple enough for you:

import string

def strpp(s):
    for i in s:
        yield i
    for i in strpp(s):
        for j in s:
            yield i + j

labels = strpp(string.lowercase)
label = # ad infinitum

Hope you enjoy Python,

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