Yay Python

def main():
    print("Body Mass Index (BMI) Program")
    print()
    weight = float(input("Enter your weight in pounds: "))
    while (weight < 50 or weight > 500):
        print('ERROR: Please enter a value between 50 and 500')
        weight = float(input('Please enter a valid weight:'))
    height = float(input("Enter your height in inches: "))
    while (height < 48 or height > 100):
        print('ERROR: Please enter a value between 48 and 100')
        weight = float(input('Please enter a valid height:'))
    incalcBMI = calcBMI(weight, height)
    displayResults(incalcBMI)

def calcBMI(weight, height):
    bmi = (weight * 703)/(height * height)
    print()
    return bmi

def displayResults(bmi):
    print("Your BMI is:",\
          format(bmi, ",.2f"))
    if bmi >= 18.5 and bmi < 25:
        print("This person is: An optimal weight")
    elif bmi >= 25:
        print("This person is: Overweight")
    elif bmi <= 18.5:
        print("This person is: Underweight")

main()