python - 如何修复名称错误: name 'author' is not defined when running python script

Question

我试图在我的 Mac 终端上打开它，但我总是收到名称“作者”未定义的信息，而它显然是定义的。

def bibformat_mla(author, title, city, publisher, year):
    author = input("enter author: ")
    title = input("enter title: ")
    city = input("enter city: ")
    publisher = input("enter publisher: ")
    year = input("enter year: ")
    answer = author + ' , ' + title + ' , ' + city + ': ' + publisher + ', ' + year
    return answer


bibformat_mla(author, title, city, publisher, year)
'author, title, city: publisher, year'

bibformat_mla("Jake, Matt", "Open Data ", "Winnipeg", "AU Press", 2013)
 'Morin, Pat. Open Data Structures. Winnipeg: AU Press, 2013'

Answer 1

当您运行以下命令时:

bibformat_mla(author,title,city,publisher,year)

您对程序说您有一个名为“author”的变量，它已准备好传递给 biblformat()。这会导致错误，因为在调用函数之前 undefined variable 。

即，您告诉函数需要某个变量，它会向您抛出错误，因为该变量实际上还不存在。

从您想要实现的目标来看，您可以简单地调用该函数，如下所示:

bibformat_mla()

您还需要将定义更改为此，以便您的函数不再需要参数:

def bibformat_mla():