关于python：该程序计算一个人的BMI。如何在不使用其他条件循环的情况下阻止用户输入零？

This program calculates the BMI of a person. How can I prevent user from inputting a zero without having to use another conditional loop?

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flag='yes'
#while loop for reccursion
while flag != 'no':
print ("
BMI Calculator")
#Exception block for catching non integer inputs
try:
#Prompting user to input weight
weight = int(input('Enter your weight in pounds : '))
while weight == 0:
sys.exit()
except ValueError:
print ('Oops!! Kindly enter only numbers.')
flag = input('Do you want to try again? yes/no : ')
continue

try:
#Prompting user to input height
height = float(input('Enter your height in inches : '))
while height == 0:
sys.exit()
except ValueError:
print ('Oops!! Kindly enter only numbers.')
flag = input('Do you want to try again? yes/no : ')
continue

#Function for calculating BMI
def bmi_calculator():
#Exception block for catching division by zero
try:
#Formula for calculating BMI
BMI = round(weight * 703/(height*height), 2)
return (BMI)
except ZeroDivisionError:
print ('Oops!! Cannot divide by zero.')
sys.exit()

是否有任何异常处理可用于仅接受非零输入？有没有办法避免另一个while或if循环？

相关讨论

如果要正确处理0个数字，其中一种方法是在输入0时引发异常：

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#Function for calculating BMI
def bmi_calculator():
flag='yes'
while flag != 'no':
print ("
BMI Calculator")
#Exception block for catching non integer inputs
try:
#Prompting user to input weight
weight = int(input('Enter your weight in pounds : '))
if weight == 0:
raise ValueError
except ValueError:
print ('Oops!! Kindly enter non-zero numbers only.')
flag = input('Do you want to try again? yes/no : ')
continue

try:
#Prompting user to input height
height = float(input('Enter your height in inches : '))
if height == 0:
raise ValueError
except ValueError:
print ('Oops!! Kindly enter non-zero numbers only.')
flag = input('Do you want to try again? yes/no : ')
continue

#Formula for calculating BMI
BMI = round(weight * 703/(height*height), 2)
return (BMI)

print(bmi_calculator())

我还用if语句替换了while weight == 0和while height == 0 - 它们看起来更合适，我将main while循环放在函数defintion bmi_calculator中，这样就可以在需要时调用它。