Question

我正在尝试创建一个程序来计算一个人的BMI作为我的作业。我得到＆＃34;意外的缩进＆＃34;第9行中的错误是***打印（＆＃34;您的BMI是：＆＃34;，BMI）。我来回移动缩进来纠正它但仍然无法正常工作。请帮助，因为我只是一个初学者。提前谢谢。

user_input = float(input("Let's calculate your BMI! Please select if you 'K' for kilograms and L for pounds for your weight: ")).upper


if user_input == "K":
    user_input_weight_kgs = float(input("Weight in kgs.:"))
    user_input_height = float(input("Height by inches: "))
    user_input_age = (input("Age:"))
    BMI_for_kgs  = float(user_input_weight / (user_input_height **2))
        print ("Your BMI is: ",BMI)
    if BMI < 18.5 :
        print ("Under Weight")
    elif BMI < 26:
        print ("Normal Weight")
    else:
        print ("Over Weight")

elif user_input == "L":
    user_input_weight_lbs = float(input("Weight in lbs.: "))  
    user_input_height = float(input("Height by inches: "))
    user_input_age = (input("Age:"))
    BMI_for_lbs  = float((user_input_weight * 703) / (user_input_height **2))
        print ("Your BMI is: ",BMI)
    if BMI < 18.5 :
        print ("Under Weight")
    elif BMI < 26:
        print ("Normal Weight")
    else:
        print ("Over Weight")       

elif guess.isnumeric():
    print ("Please select an alphabet only! Letter 'K' or 'L'")
elif len(guess) > 1:
    print ("Please choose a single alphabet only! Letter 'K' or 'L'")
elif len(guess) == 0:
    print ("You need to enter a letter! Letter 'K' or 'L'")
else:
    break

Answer 1

问题是第9行（打印行）没有正确缩进，这是修复：

if user_input == "K":
    user_input_weight_kgs = float(input("Weight in kgs.:"))
    user_input_height = float(input("Height by inches: "))
    user_input_age = (input("Age:"))
    BMI_for_kgs  = float(user_input_weight / (user_input_height **2))
    print ("Your BMI is: ",BMI)
    if BMI < 18.5 :
        print ("Under Weight")
    elif BMI < 26:
        print ("Normal Weight")
    else:
        print ("Over Weight")

elif user_input == "L":
    user_input_weight_lbs = float(input("Weight in lbs.: "))  
    user_input_height = float(input("Height by inches: "))
    user_input_age = (input("Age:"))
    BMI_for_lbs  = float((user_input_weight * 703) / (user_input_height **2))
    print ("Your BMI is: ",BMI)
    if BMI < 18.5 :
        print ("Under Weight")
    elif BMI < 26:
        print ("Normal Weight")
    else:
        print ("Over Weight")       

elif guess.isnumeric():
    print ("Please select an alphabet only! Letter 'K' or 'L'")
elif len(guess) > 1:
    print ("Please choose a single alphabet only! Letter 'K' or 'L'")
elif len(guess) == 0:
    print ("You need to enter a letter! Letter 'K' or 'L'")
else:
    break

您应该只在代码块中缩进代码。缩进开始一个块，unindenting结束它。没有明确的大括号，括号或关键字来结束Python中的代码块。

修改

回答其他问题（在评论中）：

您的问题是，您希望看到字符串“K”或“L”，但您正在尝试将该字符串转换为浮点数。这应该表明出现了问题。另外，您实际上并没有调用upper()这是另一个问题（除非您的意图是调用user_input()来获取字符串的大写值，我认为这不是必需的）。解决：

user_input = input("Let's calculate your BMI! Please select if you 'K' for kilograms and L for pounds for your weight: ").upper()

Python 3

1 个答案: