Question

对我之前的问题感到抱歉。我必须回答的问题是：

身体质量指数（BMI）是大多数人体脂肪的良好指标。 BMI的公式是重量/高度2，其中重量以千克为单位，高度以米为单位。编写一个程序，提示以磅为单位的重量和以英寸为单位的高度，将值转换为公制，然后计算并显示BMI值。

到目前为止我所拥有的是：

"""
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，但这很容易。我知道在Python中等号会分配一些东西，所以我不确定这是不是问题，但我真的不知道该怎么办。真的对不起。当我运行该程序时，它说：

TypeError：/：'str'和'float'

的不支持的操作数类型

如果有人能给我任何关于我做错的提示，我会非常感激。如果没有，谢谢你的时间。再次感谢。

Answer 1

对于Python 3.x（指定）：

问题是来自input()的键盘输入是str（字符串）类型，它不是数字类型（即使用户输入数字）。但是，通过更改输入行可以很容易地解决这个问题：

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

和

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

因此将input()的字符串输出转换为数字float类型。

Answer 2

首先，有一个拼写错误：height_in_meter(S)。对于Python 2，不需要前面的float(...，但我确信这是一个好习惯。

"""
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)

Answer 3

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)

我发现这是最简单的方法，希望这有帮助

Answer 4

# 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)

通过Python计算BMI：取2

4 个答案: