what is the issue in this code?

def phase$($x$,$y$)$:

$>>>$ phase$(0,0)$

$0\mathrm{.}0$

angle $=$ math.atan$($y$/$x$)$

if x $==0$:

print$(\text{'}$cannot divided by zero'$)$

else:

return round$($angle$,3)$