def my$\_$max$($lst$)$:

maximum $=$ lst$[0]$

for x in lst:

if x $>$ maximum:

maximum $=$ x

return maximum

$(-)?$

$2$

$[4,1,12,8,0]$

$[12,6,9,11,7]$

$[9,4,6,3,4]$

$[11,4,15,7,2]$