Question

import math

A = input("Enter Wright in KG PLease :")
B = input("Enter Height in Meters Please :")



while (any(x.isalpha() for x in A)):
    print("No Letters Please")
    A = input("Enter Wright in KG PLease ")
    B = input("Enter Height in Meters Please ")

D = B ** 2

C = (float(A) / float(D))


print(C)

if  C <= 18.5: 
 print("Your Under Weight")

elif  C >= 18.5 and C <= 24.9:
  print ("Your Heathy Weight")

elif C >= 25.0 and C <= 29.0:
  print ("Your Over Weight")

我一直在收到TypeError（“ **或pow（）不支持的操作数类型：'str'和'int'”，）我想对用户输入B求平方，但我不知道为什么对不起听起来真的很蠢

Answer 1

尝试做

B = float(input( "Enter Height in meters : "))

Answer 2

您可以通过强制转换为float并捕获ValueError来检测无效输入，从而简化此操作。请注意，将其分为两个while循环更为用户友好，每个循环分别用于a和b，但这只是为了说明这一点：

a = b = None

while not (a and b):
    try:
        a = float(input("Weight (kg): "))
        b = float(input("Height (m): "))
    except ValueError:
        print("Invalid input")

c = a / (b ** 2)

if c <= 18.5:
    print("Underweight")
elif 18.5 < c < 25:
    print("Healthy weight")
else:
    print("Overweight")

另外，not (a and b)将在输入之一为零的情况下继续请求输入，在这种情况下，我认为这是适当的行为。

TypeError（“ **或pow（）不支持的操作数类型：'str'和'int'”，）

2 个答案: