How do i replace my if statement with 'var = bool(test)'?

Why do i get this error when validating saying: The if statement can be replaced with 'var = bool(test)' (simplifiable-if-statement)

This is my code:

summer_word = "vacation"
letter = "s"

if letter in summer_word: 
    result = True
else:
    result = False
print(result)

I really don't know what I'm doing wrong here, please help