Question

def BMI_calculator(inches, weight):
    """ This function takes a persons height in feet and inches and their
weight in pounds and calculates their BMI"""

# Now we can just convert and calculate BMI

    metric_height= inches* .025
    metric_weight= weight* .45
    BMI = int(metric_weight/(metric_height)**2)
    print BMI
    return BMI

def BMI_user_calculator():
    """ This function will ask the user their body information and calulate
the BMI with that info"""
# First we need to gather information from the user to put into the BMI calculator
    user_weight = int(raw_input('Enter your weight in pounds: '))
    user_height = int(raw_input('Enter your height in inches: '))

    print "Youre BMI is", 

    BMI_calculator(user_height, user_weight)

    If BMI < 18.5:
        print "You're BMI is below the healthy range for your age"
    elif BMI > 24.9:
        print "You're BMI is above the healthy range for your age"
    else:
        print "You are in the healthy BMI range!"

这是我到目前为止的代码，但是在运行时，我在if语句中收到语法错误，指出BMI未定义。 BMI从第一个函数返回，所以我真的不明白发生了什么

Answer 1

您的BMI中没有声明BMI_user_calculator()，这就是为什么它没有定义BMI。在if-elif语句中使用BMI进行比较之前，您应首先声明BMI。

此外，您的If应为if。 Python区分大小写。

您的代码应该是这样的：

def BMI_calculator(inches, weight):
    metric_height= inches* .025
    metric_weight= weight* .45
    BMI = int(metric_weight/(metric_height)**2)
    # No need to print BMI here anymore since you're returning it anyway
    # print BMI
    return BMI

def BMI_user_calculator():
    user_weight = int(raw_input('Enter your weight in pounds: '))
    user_height = int(raw_input('Enter your height in inches: '))

    BMI = BMI_calculator(user_height, user_weight)

    print "Your BMI is", BMI

    if BMI < 18.5:
        print "Your BMI is below the healthy range for your age"
    elif BMI > 24.9:
        print "Your BMI is above the healthy range for your age"
    else:
        print "You are in the healthy BMI range!"

if __name__ == '__main__':
    BMI_user_calculator()

我不明白为什么我被告知我有语法错误

1 个答案: