your code should be like this:
def calcBMI(weightlb, heightin):
   bmi = weightlb * 703/ heightin **2
   return bmi
def main():
    weightlb = float(input("Enter your weight in pounds: "))
    heightin = float(input("Enter your height in inches: "))`
    bmi = calcBMI(weightlb, heightin)
    print("Your BMI is %f" %bmi)
main()
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solved Writing basic BMI analysis program for python