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对不起我之前的问题。我必须回答的问题是：

对于大多数人来说，体重指数 (BMI) 是衡量体脂率的良好指标。BMI 的公式是体重/身高2，其中体重以千克为单位，身高以米为单位。编写一个程序，提示以磅为单位的体重和以英寸为单位的身高，将值转换为公制，然后计算并显示 BMI 值。

我到目前为止是这样的：

"""
BMI Calculator

1. Obtain weight in pounds and height in inches
2. Convert weight to kilograms and height to meters
3. Calculate BMI with the formula weight/height^2
"""

#prompt user for input from keyboard
weight= input ("How much do you weigh (in pounds)?")
#this get's the person's weight in pounds

weight_in_kg= weight/2.2
#this converts weight to kilograms

height= input ("What is your height (in inches)?")
#this gets the person's height in inches

height_in_meter=height*2.54
#this converts height to meters

bmi=weight_in_kg/(height_in_meters*2)
#this calculates BMI

print (BMI)

我的第一步有效，但这是容易的部分。我知道在 Python 中等号分配了一些东西，所以我不确定这是否是问题所在，但我真的不知道该怎么做。真的对不起。当我运行程序时，它说：

TypeError : 不支持的操作数类型 /: 'str' 和 'float'

如果有人能给我任何关于我做错了什么的提示，我将不胜感激。如果没有，感谢您抽出宝贵时间。再次感谢。

4

4 回答 4

4

对于 Python 3.x（如指定）：

问题是键盘输入input()是类型str（字符串），它不是数字类型（即使用户输入数字）。但是，这很容易通过更改输入行来解决，如下所示：

weight = float(input("How much do you weigh (in pounds)?"))

和

height = float(input("What is your height (in inches)?"))

从而将字符串输出input()转换为数字float类型。

于 2012-11-21T00:39:06.310 回答
2

首先，有一个错字：height_in_meter(S). 对于 Python 2，前面float(...不是必需的，尽管我确信这是一个很好的做法。

"""
BMI Calculator

1. Obtain weight in pounds and height in inches
2. Convert weight to kilograms and height to meters
3. Calculate BMI with the formula weight/height^2
"""

#prompt user for input from keyboard
weight= input ("How much do you weigh (in pounds)?")
#this get's the person's weight in pounds

weight_in_kg= weight/2.2
#this converts weight to kilograms

height= input ("What is your height (in inches)?")
#this gets the person's height in inches

height_in_meter=height*2.54/100
#this converts height to centimeters

bmi=weight_in_kg/(height_in_meter**2)
#this calculates BMI

print (bmi)
于 2013-01-25T23:14:40.313 回答
0 
# height and weight are available as a regular lists

# Import numpy
import numpy as np

# Create array from height with correct units: np_height_m
np_height_m = np.array(height) * 0.0254

# Create array from weight with correct units: np_weight_kg 
np_weight_kg = np.array(weight) * 0.453592

# Calculate the BMI: bmi
bmi =  np_weight_kg / (np_height_m **2)

# Print out bmi
print(bmi)
于 2016-08-03T11:45:33.173 回答
0 
weight= float(input("How much do you weigh (in kg)?"))
weight_in_kg= float(input("Enter weight in kg?"))


#height= float(input("What is your height (in meters)?"))
height_in_meter= float(input("Enter height in metres?"))


bmi=weight_in_kg/(height_in_meter**2)


print (bmi)

我发现这是使其工作的最简单方法，希望这会有所帮助

于 2015-07-26T12:12:05.140 回答