/ 不支持的操作数类型：“str”和“str”[重复]答案

【问题标题】：unsupported operand type(s) for /: 'str' and 'str' [duplicate]/ 不支持的操作数类型：“str”和“str”[重复]
【发布时间】：2013-08-18 16:46:26
【问题描述】：

print("Please enter your Weight")
weight = input(">")
print("Please enter your height")
height = input(">")
bmi = weight/height
if int(bmi) <= 18:
print("you are currently under weight")
elif int(bmi)>=24:
print("you are normal weight")
else:
print("you are over weight")

追溯

File "C:\Users\reazonsraj\Desktop\123.py", line 6, in <module>
bmi = weight/height
TypeError: unsupported operand type(s) for /: 'str' and 'str'

【问题讨论】：

您正在输入一个字符串，然后尝试将其与字符串分开，将您的输入转换为 int
使用int:int(weight)/int(height)
顺便说一句，这不是您计算 BMI 的方式。

标签： python type-conversion

【解决方案1】：

print("Please enter your Weight")
weight = float(input())
print("Please enter your height")
height = float(input())
bmi = weight/height
if (bmi) <= 18:
print("you are currently under weight")
elif (bmi)>=24:
print("you are normal weight")
else:
print("you are over weight")

【讨论】：

感谢一群人刚刚解决了它，并得到了正确的方法来做 bmi :)

【解决方案2】：

当输入数据时，它被保存为一个字符串。您需要做的就是将其转换为 int。

print("Please enter your Weight")
weight = int(input(">"))
print("Please enter your height")
height = int(input(">"))
bmi = weight/height
if int(bmi) <= 18:
print("you are currently under weight")
elif int(bmi)>=24:
print("you are normal weight")
else:
print("you are over weight")

这将解决一个问题，但不能解决所有问题。如果您要输入十进制数，那么您将收到ValueError，因为int() 处理整数。要解决此问题，您需要使用 float() 而不是 int。

print("Please enter your Weight")
weight = float(input(">"))
print("Please enter your height")
height = float(input(">"))
bmi = weight/height

【讨论】：

但是当我输入高度为 5.5 时，它会显示此错误 ValueError: invalid literal for int() with base 10: '5.5'

【解决方案3】：

def enter_params(name):
    print("Please enter your {}".format(name))
    try:
        return int(input(">"))
    except ValueError:
        raise TypeError("Enter valid {}".format(name)) 
height = enter_params('height')
weight = enter_params('weight')
bmi = int(weight/height)
if bmi <= 18:
    print("you are currently under weight")
elif bmi >= 24:
    print("you are normal weight")
else:
    print("you are over weight")

【讨论】：