How do I get this if else statement to work

theslasher 0
Viewed 49

So I am trying to calculate BMI which allows user to choose the metric or imperial system. For example if user input metric 1.8 78. The program will calculate base on the system chosen either imperial or metric. However after inputting the formula and also doing the if else statement the output is not showing the result. Need some advice

import sys
                len(sys.argv) == 4
    #ensure correct str and float is inputted
                try:
                    units = (sys.argv[1])
                    weight = float(sys.argv[2])
                    height = float(sys.argv[3])
                except (ValueError, IndexError):
                    print("Your input is invalid!")
            #to ensure only 'metric' or 'imperial' is inputted
                while True:
                    units = (sys.argv[1])
                    if units == ('metric' or 'imperial'):
                        break
                    else:
                        print("Your input is invalid")
    #calculations for the bmi
                metric_bmi = weight / (height ** 2)
                us_bmi = 703*weight/ (height ** 2)
    #to check for which system to calculate and the result of the bmi to give the output
                if units == 'metric' and metric_bmi == 16:
                    print("BMI:%.2f" % metric_bmi + "\tSevere Thinness")
                elif units == 'metric' and 16 == metric_bmi <17:
                    print("BMI:%.2f" % metric_bmi + "\tModerate Thinness")
                elif units == 'metric' and 17 == metric_bmi < 18.5:
                    print("BMI:%.2f" % metric_bmi + "\tMild Thinness")
                elif units == 'metric' and 18.5 == metric_bmi < 25:
                    print("BMI:%.2f" % metric_bmi + "\tNormal")
                elif units == 'metric' and 25 == metric_bmi < 30:
                    print("BMI:%.2f" % metric_bmi + "\tOverweight")
                elif units == 'metric' and 30 == metric_bmi < 35:
                    print("BMI:%.2f" % metric_bmi + "\tObese Class I ")
                elif units == 'metric' and 35 == metric_bmi < 40:
                    print("BMI:%.2f" % metric_bmi + "\tObese Class II")
                elif units == 'metric' and  metric_bmi > 40:
                    print("BMI:%.2f" % metric_bmi + "\tObese Class III")
                else:
                print("Your input is invalid!")
                if units == 'imperial' and us_bmi == 16:
                    print("BMI:%.2f" % us_bmi + "\tSevere Thinness")
                elif units == 'imperial' and 16 == us_bmi == 16<17:
                    print("BMI:%.2f" % us_bmi + "\tModerate Thinness")
                elif units == 'imperial' and 17 == us_bmi < 18.5:
                    print("BMI:%.2f" % us_bmi + "\tMild Thinness")
                elif units == 'imperial' and 18.5 == us_bmi < 25:
                    print("BMI:%.2f" % us_bmi + "\tNormal")
                elif units == 'imperial' and 25 == us_bmi < 30:
                    print("BMI:%.2f" % us_bmi + "\tOverweight")
                elif units == 'imperial' and 30 == us_bmi < 35:
                    print("BMI:%.2f" % us_bmi + "\tObese Class I")
                elif units == 'imperial' and 35 == us_bmi < 40:
                    print("BMI:%.2f" % us_bmi + "\tObese Class II")
                elif units == 'imperial' and  us_bmi > 40:
                    print("BMI:%.2f" % us_bmi + "\tObese Class III")
                else:
                    print("Your input is invalid!")
python
1 Answers
import sys
if len(sys.argv) == 4:
    #ensure correct str and float is inputted
    try:
        units = str(sys.argv[1])
        weight = float(sys.argv[2])
        height = float(sys.argv[3])
    except:
        raise ValueError("Your input is invalid!")
        #to ensure only 'metric' or 'imperial' is inputted
    if not units in ('metric', 'imperial'):
        raise ValueError("Your unit type input is invalid")
    #calculations for the bmi
    metric_bmi = weight / (height ** 2)
    us_bmi = 703*weight/ (height ** 2)
    #to check for which system to calculate and the result of the bmi to give the output
    if units == 'metric':
        if metric_bmi < 16:
            print("BMI:%.2f" % metric_bmi + "\tSevere Thinness")
        elif metric_bmi < 17:
            print("BMI:%.2f" % metric_bmi + "\tModerate Thinness")
        elif metric_bmi < 18.5:
            print("BMI:%.2f" % metric_bmi + "\tMild Thinness")
        elif metric_bmi < 25:
            print("BMI:%.2f" % metric_bmi + "\tNormal")
        elif metric_bmi < 30:
            print("BMI:%.2f" % metric_bmi + "\tOverweight")
        elif metric_bmi < 35:
            print("BMI:%.2f" % metric_bmi + "\tObese Class I ")
        elif metric_bmi < 40:
            print("BMI:%.2f" % metric_bmi + "\tObese Class II")
        else:
            print("BMI:%.2f" % metric_bmi + "\tObese Class III")
    else:
        if us_bmi < 16:
            print("BMI:%.2f" % us_bmi + "\tSevere Thinness")
        elif us_bmi < 17:
            print("BMI:%.2f" % us_bmi + "\tModerate Thinness")
        elif us_bmi < 18.5:
            print("BMI:%.2f" % us_bmi + "\tMild Thinness")
        elif us_bmi < 25:
            print("BMI:%.2f" % us_bmi + "\tNormal")
        elif us_bmi < 30:
            print("BMI:%.2f" % us_bmi + "\tOverweight")
        elif us_bmi < 35:
            print("BMI:%.2f" % us_bmi + "\tObese Class I")
        elif us_bmi < 40:
            print("BMI:%.2f" % us_bmi + "\tObese Class II")
        else:
            print("BMI:%.2f" % us_bmi + "\tObese Class III")
else:
    print("You didn't enter the correct number of arguments")
userYE4D0
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