def findZero$($ set$)$:

$i=0$

for $n$ in set:

if $(n==0)$ :

$x=$ true

return False

numbers $=\{3,4,8,12,43,21,7,9,8\}$

$y=$ findZero$($numbers$)$

if True$)$:

print$("$zero exist"$)$

else:

print$("$zero doesn't exist"$)$

The output of the code is:

zero doesn't exist