Exercise $8\mathrm{.}3.$ A string slice can take a third index that specifies the $$step size$$; that is$,$ the number

of spaces between successive characters. A step size of $2$ means every other character; $3$ means every

third, etc.

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$80$ Chapter $8.$ Strings

$>>>$ fruit $=$ 'banana'

$>>>$ fruit$[0$:$5$:$2]$

$\text{'}$bnn$\text{'}$

A step size of $-1$ goes through the word backwards, so the slice $[$::$-1]$ generates a reversed string.