Consider the following Python function, whose central job is to manipulate a list.

def do

$\_$

something

$($

x

$)$

:

$$ for i in range

$($

len

$($

x

$)$

$/$

$/$

$2$

$)$

:

$$ x

$[$

i

$]$

$,$

$$x

$[$

$-$

$1$

$-$

$$i

$]$

$=$

$$x

$[$

$-$

$1$

$-$

$$i

$]$

$,$

$$x

$[$

i

$]$