程序根据用户输入的体重和身高计算出一个人的体重指数。但是，输入“metric”或“imperial”并按enter键后，程序将关闭。前三个打印功能工作正常，之后的任何内容都不会在我按下回车键后出现。我该怎么解决？print('\t\t\t BMI Calculator')

print('\t\t\t By Abdinasir Hussein')

print('\n Hello, this is a BMI Calculator!')

input('Do you wish to enter metric units or imperial units: ')

while input == 'metric':

height = float(input('Please enter your height input meters(decimals): '))

weight = int(input('Please enter your weight input kg: '))

bmi = weight/(height*height)

if bmi <= 18.5:

print('Your BMI is', bmi,'which means you are underweight.')

elif bmi > 18.5 and bmi < 25:

print('Your BMI is', bmi,'which means you are normal.')

elif bmi > 25 and bmi < 30:

print('your BMI is', bmi,'overweight.')

elif bmi > 30:

print('Your BMI is', bmi,'which means you are obese.')

else:

print('There is an error with your input')

print('Please check you have entered whole numbers\n'

'and decimals were asked.')

while input == 'imperial':

height = int(input('Please enter your height input inputches(whole number): '))

weight = int(input('Please enter your weight input pounds(whole number): '))

bmi = (weight*703)/(height*height)

if bmi <= 18.5:

print('Your BMI is', bmi,'which means you are underweight.')

elif bmi > 18.5 and bmi < 25:

print('Your BMI is', bmi,'which means you are normal.')

elif bmi > 25 and bmi < 30:

print('Your BMI is', bmi,'which means you are overweight')

elif bmi > 30:

print('Your BMI is', bmi,'which means you are obese.')

else:

print('There is an error with your input')

print('Please check you have entered whole numbers\n'

'and decimals were asked.')

input('\n\nPlease press enter to exit.')

我现在已经更改了，但是如何编辑此块：input = input('Do you wish to enter metric units or imperial units: ')

if input == 'metric':

height = float(input('Please enter your height input meters(decimals): '))

weight = int(input('Please enter your weight input kg: '))

bmi = weight/(height*height)

if bmi <= 18.5:

print('Your BMI is', bmi,'which means you are underweight.')

elif bmi > 18.5 and bmi < 25:

print('Your BMI is', bmi,'which means you are normal.')

elif bmi > 25 and bmi < 30:

print('your BMI is', bmi,'overweight.')

elif bmi > 30:

print('Your BMI is', bmi,'which means you are obese.')

else:

print('There is an error with you inputput')

print('Please check you have entered whole numbers\n'

'and decimals where asked.')