未定义函数

Question

def winheight(height):

    try:
        height = int(raw_input('Enter the height of the window in metres: '))
    except ValueError:
        print 'Please enter an integer'
        winheight(height)

    winlength(length)

def winlength(length):

    try:
        length = int(raw_input('Enter the length of the window in metres: '))
    except ValueError:
        print 'Please enter an integer'
        winlength(length)

    pricing(height, length)

def pricing(height, length):

    height_length = height * length

    price = int(height_length) * 100

    total = int(price) + 50

    print int(total)

winheight(height)

这是我正在尝试的代码，用于完成 window 替换业务的 class 任务，每平方米的成本为 100 美元 + 最初的 50 美元

然而，每当我尝试运行这段代码时，我都会收到错误消息：

line 31, in winheight(height) NameError: name 'height' is not defined

我需要全局定义高度和长度，以便我可以使用它们来支付最终费用，我不确定如何解决这个问题，任何帮助将不胜感激

Answer 1

height确实没有定义。您在函数中定义的 height 变量是一个 local 变量。它在函数调用结束后停止存在。您可以 return 它，或使用全局变量（但不要使用全局变量）

 def get_height():
     while True:
        try:      
          height = input()
        except ValueError:
          continue
        else:
          return height

并通过 height = get_height() 从您的主脚本调用它（在调用 pricing(height, length).

之前 length) 类似

一些其他注意事项：

再次尝试 input()，使用 while 循环而不是递归调用函数（因为这会使之前的函数堆栈保持打开状态）
传递 height 变量并重新分配 height = input 没有意义。传递给 height 的值是一个副本，所以原始值不会改变。

Answer 2

您的代码应如下所示：

def winheight(): #define window-height-getting function
    while True:
        try:
            height = int(raw_input("Enter the height of the window in metres: ")) #get user input for window height
            return height
        except ValueError: #catch improper inputs
            print "Please enter an integer"
def winlength(): #define window-length-getting function
    while True:
        try:
            length = int(raw_input("Enter the length of the window in metres: ")) #get user input for window length
            return length
        except ValueError: #catch improper inputs
            print "Please enter an integer"

def pricing(height, length): #define price-calculating function
    area = height * length #math to determine total price
    price = area * 100
    total = price + 50
    return total

user_height = winheight() #get window height from user
user_length = winlength() #get window length from user

total_price = pricing(user_height, user_length) #calculate total price by passing user window height and length to the pricing function

print "The total price is: $" + str(total_price) #print result

未定义函数

Function not being defined

python

undefined

python-2.7