def has$\_$a$\_$vowel$($s$)$:

$"""$

Returns: True if s has at least one vowel $($a$,$ e$,$ i$,$ o$,$ or u$)$

This function does not count y as a vowel.

Parameter s: a string to check

Precondition: s is a non$-$empty string with all lower case letters

This function may include intentional errors.

$"""$

return $\text{'}$a$\text{'}$ in s and $\text{'}$e$\text{'}$ in s and $\text{'}$i$\text{'}$ in s and $\text{'}$o$\text{'}$ in s and $\text{'}$u$\text{'}$ in s