Python:raw_input和不受支持的操作数类型 [英] Python: raw_input and unsupported operand type(s)

问题描述

我是Python的新手，最近一直在尝试创建BMI计算器，但是以下代码出现错误:

I am a newbie to Python and have been recently attempting to create a BMI calculator, but I am having errors with the following code:

def calculator():

    weight = raw_input('Please enter your weight (kg):')

    if weight.isdigit and weight > 0:
        height = raw_input('Please enter your height (m):') 

        if height.isdigit and height > 0:
            bmi = (weight) / (height ** 2) 

            print "Your BMI is", bmi

            if bmi < 18.5:
                print 'You are underweight.'
            if bmi >= 18.5 and bmi < 25:
                print 'Your BMI is normal.'
            if bmi >= 25 and bmi < 30:
                print 'You are overweight.'
            if bmi >= 30:
                print 'You are obese.'      

        else:   
            height = raw_input('Please state a valid number (m):')


    else:
        weight = raw_input('Please state a valid number (kg):')

每当我尝试执行代码时，我都可以输入体重和身高，但是随后我会遇到以下错误消息:

Whenever I try to execute the code, I am able to enter weight and height, but I am then confronted with this error message:

Traceback (most recent call last):
  File "*location*", line 40, in <module>
    calculator()
  File "*location*", line 15, in calculator
    bmi = (weight) / (height ** 2)
TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'

我为这个愚蠢的问题和错误缠身的代码表示歉意，但是我对编程非常陌生，并感谢任何形式的帮助. :)

I apologize for this dumb question and error-ridden code, but I am very new to programming and appreciate any kind of help. :)

推荐答案

raw_input始终返回str对象.您需要将输入显式转换为int. 你可以做

raw_input always returns a str object. You need to explicitly convert the input to an int. You can either do

val = int(raw_input(...))

或

val = raw_input(...)
val = int(val) 

正如其他人所提到的，您的代码中有很多错误.这是一个:

As others have mentioned, there are many errors in your code. Here is one:

if height == exit:

与weight条件相同的问题.我只是要指出一点，因为您没有问这个问题，所以我将让您找出问题所在:).

Same problem with weight condition. I am just going to point out as you didn't ask about this in question so I will let you find out what the problem is :).

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