How to replace the last (and only last) character in a string?

[Grant Edwards]

On 2007-05-03, Johny <python at hope.cz> wrote:
> Let's suppose
> s='12345 4343 454'
> How can I replace the last '4' character?

>>> s = '12345 4343 454'
>>> s = s[:-1] + 'X'
>>> s
'12345 4343 45X'

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