新的python,写函数

Question

我正在尝试学习几种语言,因此我在不同语言上也会遇到同样的问题.这是我的代码:

def read_one_file():
    with open('C:\Python27\inventory.dat', 'r') as f:
        invid = f.readline().strip()
        invtype = f.readline().strip()
        price = f.readline().strip()
        stock = f.readline().strip()
        title = f.readline().strip()
        author = f.readline().strip()
        published = f.readline().strip()

        return invid, invtype, price, stock, title, author, published


def write_one_file(holdId, holdType, holdPrice, holdStock, holdTitle, holdAuthor, holdPublished):
    with open('C:\Python27\inventory.dat', 'w') as f:
        invid = holdId
        price = holdPrice
        newstock = holdStock
        published = holdPublished
        f.write("Item Id: %s\n" %invid)
        f.write("Item Type: %s\n" %holdType)
        f.write("Item Price: %s\n" %price)
        f.write("Number In Stock: %s\n" %newstock)
        f.write("Title: %s\n" %holdTitle)
        f.write("Author: %s\n" %holdAuthor)
        f.write("Published: %s\n" %holdPublished)
        return

invid, invtype, price, stock, title, author, published = read_one_file()

print "Update Number In Stock"
print "----------------------"
print "Item ID: ", invid
print "Item Type: ", invtype
print "Price: ", price
print "Number In Stock: ", stock
print "Title: ", title
print "Author/Artist: ", author
print "Published: ", published
print "----------------------"
print "Please Enter New Stock Number: "
newstock = raw_input(">")


write_one_file(invid, invtype, price, newstock, title, author, published)

编辑:我已经尝试使用str()转换但仍然没有运行.EDIT2:我最终将%d更改为%s并且似乎有效.唯一的问题是当我运行它时,它倾向于将书放在123456上.

最终在控制台中发生了什么

    Update Number In Stock
----------------------
Item ID:  123456book
Item Type:  69.99
Price:  20
Number In Stock:  
Title:  Walter_Savitch
Author/Artist:  2011
Published:  
----------------------
Please Enter New Stock Number: 
>

这是.txt文件:

123456book 69.99 20

Walter_Savitch 2011

换行的东西？

Answer 1

f.write()期望一个字符串作为参数.你定义invid,invtype等的元组,它不会自动转换为字符串.您可以使用该str()函数显式转换它们,或者您更喜欢使用某些字符串格式,例如:

"Number in stock%d"%nrStock

其中"%d"表示nrStock是一个整数.

你会注意到我已经将你的d变量重命名为nrStock.使用描述性变量名称通常是一种好习惯,或者更好的想法可能是使用字典.