Question

这个程序是关于从“邮购”房屋订购东西。

他们销售五种产品。 P1 = 2.98，P2 = 4.5，P3 = 9.98，P4 = 4.49，P5 = 6.87

到目前为止，这是我的代码。

#Imports: None

#Defs:

def userInput1():
    x = int(input("Product Number?"))
    return x
def userInput2():
    q = int(input("Quantity?"))
    return q
def calculations(x,q):
    p1 = 2.98
    p2 = 4.5
    p3 = 9.98
    p4 = 4.49
    p5 = 6.87
    subtotal = q * x
    return subtotal
def final(subtotal):
    print ("Total:", subtotal)
def loop():
    cont = input("Do you want to continue? (yes/no)")
    if cont == 'yes':
        main()
        return
    else:
        final()

def main():
    x = userInput1()
    subtotal = calculations(x,q)
    final(subtotal)
#Driver:
main()

我必须使用哨兵控制的循环。

这是我的追溯。

Traceback (most recent call last):
  File "C:\Documents and Settings\user1\My Documents\Downloads\az_mailorder3.py", line 49, in <module>
    main()
  File "C:\Documents and Settings\user1\My Documents\Downloads\az_mailorder3.py", line 46, in main
    subtotal = calculations(x,q)
NameError: name 'q' is not defined

这是它应该如何运作。

Product number?: 1
Quantity?: 2
Continue?(yes/no): yes
Product number?: 2
Quantity?: 5
Continue?(yes/no): yes
Product number?: 3
Quantity?: 3
Continue?(yes/no): yes
Product number?: 4
Quantity?: 1
Continue?(yes/no): no
Total: $62.89

可能存在更深层次的问题。

Answer 1

假设你是编程的新手（我可以从你的代码中感受到）并且这个问题似乎是学校的功课很容易，而且你也不想尝试调试它（你需要调试很多）成为一名优秀的程序员）
在这里，我向您展示您的代码，并提供适当的注释，以解释您的代码出错的原因。从主函数开始读取（而不是从第一行开始）

def userInput1():
    x = int(input("Product Number?"))
    return x
def userInput2():
    q = int(input("Quantity?"))
    return q
def calculations(x,q):
    p1 = 2.98
    p2 = 4.5
    p3 = 9.98
    p4 = 4.49
    p5 = 6.87
    subtotal = q * x
#here you are multiplying the item number by quantity 
#not the price by quantity (use proper if else to check price for item number
# return to main function again for more comments
    return subtotal
def final(subtotal):
    print ("Total:", subtotal)
#nothing wrong here but since we have declared subtotal as global (remember that?)
#so no need to pass subtotal by argument.
def loop():
    cont = input("Do you want to continue? (yes/no)")
    if cont == 'yes':
        main()
        return
    else:
        final()
#you are calling final() but you declared with argument (are you mad?)
#now check final function

def main():
    x = userInput1()
#Where you are taking input from user for quantity??
#first take quantity as input q = userInput2() 
    subtotal = calculations(x,q)
#now every time you call main function your subtotal will be revised
#remember teacher talking about global and local variables?
#subtotal needs to be global (declare it somewhere outside the functions
#now even if subtotal is global you need to increment it (not reassign)
# use subtotal += calculations(x,q)
#now check your calculations function 
    final(subtotal)
#you are calling final subtotal but where the hell you calling your loop?
#call it before calling final and now check your loop function
main()

希望现在您能够编写正确的代码但即使您现在无法编写正确的代码，here也可以为您提供帮助。但是先尝试自己编写代码。快乐调试：）

Python：在程序中使用defs来订购东西

1 个答案: