Variable is not defined error when trying to use my custom function code

[menator01]

Please use bbtags when posting code.

hello is a string and needs to be 'hello' as well as the letter 'h'

Example:

def contains_letter(string, letter):
    for letters in string:
        if letters == letter:
            return True
    return False

print(contains_letter('hello', 'h'))

output

Output:
True