无论给出阈值的顺序如何，我如何才能找到一个值是否介于两个特定阈值之间？

Question

For example, if I have a value a = 4 and two input thresholds t1 = 3 and t2 = 5 .

a > t1 and a < t2 so the function func(a, t1, t2) returns true.

But if I input t1 = 5 and t2 = 3 , even if a = 4 lies between the t1 and t2 , the function returns false. How to solve this?

So far I write this function in this way, but it only works when t1 < t2 . Is there some smart way to do this?

def func(a, t1, t2):
    if a > t1 and a < t2:
        return True
    else:
        return False

Answer 1

You can use or :

def func(a, t1, t2):
    return t1 < a < t2 or t2 < a < t1

print(func(4, 3, 5)) # True
print(func(4, 5, 3)) # True
print(func(4, 1, 2)) # False

Note that python allows chained comparisons so that you don't need to write t1 < a and a < t2 . Also, you don't need the redundant if statement as in:

if t1 < a < t2 or t2 < a < t1:
    return True
else:
    return False

Answer 2

You could order the two thresholds before using them in the comparison with a , for example by using the sorted function:

smaller, larger = sorted([t1, t2])

If t1 <= t2 then smaller will be t1 and larger will be t2 , otherwise smaller will be t2 and larger will be t1 .

def func(a, t1, t2):
    smaller, larger = sorted([t1, t2])
    return smaller < a < larger