Comparison Function Returns True or False

Question

In my python CS class at school, we were given a true or false question as follows.

A comparison function returns either True or False.

When originally answering I thought about two things. First, a function as follows (what I thought was a comparison function) returns true or false.

def comparison(valOne,valTwo):
    return valOne<valTwo

Now, I know this isn't a comparison function, but a function with an operator. In addition, I thought of another type of function when answering.

def someoneHasOne(scoreOne,scoreTwo):
    return scoreOne==15 or scoreTwo==15

From what I know, this is a comparison function.

So, thinking of those two things, I marked this as True.

However, the correct answer, according to the teacher, was False. After the answer was marked wrong, I started to do some research. I found this about the operator module that has comparison functions that return True or False

My main question is, am I right (the answer is True)? Or is my CS teacher right (the answer is False)?

Answer 1

If this is a python class, then yes, your CS teacher is correct. A number of python functions take a "comparison function" as an argument. For instance, see the sorted documentation:

cmp specifies a custom comparison function of two arguments (iterable elements) which should return a negative, zero or positive number depending on whether the first argument is considered smaller than, equal to, or larger than the second argument: cmp=lambda x,y: cmp(x.lower(), y.lower()). The default value is None.

How comparison functions work varies by language, though most follow a similar fashion. But since this is specifically a question about python, the answer is unambiguously "false" in that comparison functions do not always return just True or False.