Can anyone explain why this worked?

Question

My code for BMI calculator:
weight = int(input())
height = float(input())
bmi = float(weight / (height ** 2))

if bmi < 18.5:
print("Underweight")
elif 18.5 >= bmi < 25:
print("Normal")
elif 25 >= bmi < 30:
print("Overweight")
else:
print("Obesity")

This cleared the 2 visible test cases but not the hidden ones.

The code that cleared all the test cases:
weight = int(input());
height = float(input());
bmi = weight / float(height ** 2);
if bmi<18.5:
print('Underweight')
elif bmi>=18.5 and bmi<25:
print("Normal")
elif bmi>=25 and bmi<30:
print('Overweight')
else:
print('Obesity')

Why did adding another float() cleared those cases?

Answer 1

the comparison in the if... construct can also be done like this:

weight = float(input())
height = float(input())
bmi = weight / (height * height)

if bmi < 18.8:
print("Underweight")
elif bmi < 25:
print("Normal")
elif bmi < 30:
print("Overweight")
else:
print("Obesity")

Answer 2

Hi Faiz!
Using float() isn't the reason your first code is not working. It's not working because you used interval comparison in wrong format. You may check that once. It needs to be like this
18.5 <= bmi < 25
And the same goes to the next condition

Answer 3

If you read the task instruction carefully, you'll find that input is float for height

Answer 4

My bad I wrote it wrong here, now It's edited

Answer 5

Hey JUMP_LINK__&&__Python__&&__JUMP_LINK Learner , I think the comparison is right as the question states:

Underweight = less than 18.5
Normal = more or equal to 18.5 and less than 25
Overweight = more or equal to 25 and less than 30
Obesity = 30 or more