类型错误：不支持的操作类型为：“浮动”和“浮动”

Question

我写了这个简单的程序来计算一个人的BMI。但我无法执行完成。下面是我的程序，

程序

h = input("Please Enter your height in meters:") 
q = raw_input("Do you want to enter your weight in kg or lbs?") 

if q=="kg": 
     w1 = input("Please Enter your weight in kgs:") 
     bmi1 = w1/(h*h) 
     print "Your BMI is", bmi1 

     if bmi1 <= 18.5: 
         print "Your are underweight." 
     if bmi1 > 18.5 & bmi1 < 24.9: 
            print "Your weight is normal." 
     if bmi1 > 25 & bmi1 < 29.9: 
            print "Your are overweight"    
     if bmi1 >= 30: 
         print "Your are obese"      


if q=="lbs": 
      w2 = input("Please Enter your weightin lbs:") 
      bmi2 = w2/((h*h)*(39.37*39.37)*703) 
      print "Your BMI is:", bmi2 

      if bmi2<= 18.5: 
         print "Your are underweight." 
      if bmi2>18.5 & bmi2<24.9: 
            print "Your weight is normal." 
      if bmi2>25 & bmi2<29.9: 
           print "Your are overweight"   
      if bmi2>=30: 
        print "Your are obese" 

输出

Please Enter your height in meters:1.52 
Do you want to enter your weight in kg or lbs?kg 
Please Enter your weight in kgs:51 
Your BMI is 22.074099723 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "bmi.py", line 11, in <module> 
    if bmi1 > 18.5 & bmi1 < 24.9: 
TypeError: unsupported operand type(s) for &: 'float' and 'float' 

我要去哪里错了？任何人都只是让我知道..

谢谢:)。

Answer 1

&是bitwise operator，我想你是在寻找布尔值and。

但是请注意，Python也支持以下语法：

if 18.5 < bmi1 < 24.9: 
    # ... 

---

既然你似乎已经缩进，这是你的脚本可能看起来怎么样trobled：

h = raw_input("Please enter your height in meters: ") 
h = float(h) 
w_unit = raw_input("Do you want to enter your weight in kg or lbs? ") 
w = raw_input("Please enter your weight in {}: ".format(w_unit)) 
w = int(w) 
if w_unit == "kg": 
    bmi = w/(h*h) 
elif w_unit == "lbs": 
    bmi = w/((h*h) * (39.37 * 39.37) * 703) 

print "Your BMI is {:.2f}".format(bmi) 
if bmi <= 18.5: 
    print "Your are underweight." 
elif 18.5 < bmi <= 25: 
    print "Your weight is normal." 
elif 25 < bmi < 30: 
    print "Your are overweight"    
elif bmi >= 30: 
    print "Your are obese" 

有一对夫妇的略有改善：

• 的显式转换（因为在Python 3 input功能表现得像raw_input而且也没有像Python的2 input，它可能是一个好习惯，写你的输入这样的）
• 真正改变的是bmi值，所以有不需要写两遍相同的东西。

东西剩下要做的，可能是整个脚本包装成函数:)