ATBSWP第4章实践项目:逗号代码 [英] ATBSWP Chapter 4 practice project: Comma Code

问题描述

因此，练习项目如下:

说您有一个像这样的列表值:spam = ['apples', 'bananas', 'tofu', 'cats'] 编写一个函数，该函数以列表值作为参数，并返回一个字符串，其中所有项目均以逗号和空格分隔，并在最后一项之前插入并插入.例如，将先前的spam列表传递给该函数将返回'apples, bananas, tofu, and cats'.但是您的函数应该能够处理传递给它的任何列表值.

Say you have a list value like this: spam = ['apples', 'bananas', 'tofu', 'cats'] Write a function that takes a list value as an argument and returns a string with all the items separated by a comma and a space, with and inserted before the last item. For example, passing the previous spam list to the function would return 'apples, bananas, tofu, and cats'. But your function should be able to work with any list value passed to it.

到目前为止，我已经提出了这个建议:

So far I've come up with this:

spam = ['apples', 'bananas', 'tofu', 'cats']

def commacode(a_list):
    a_list.insert(-1, 'and')
    print(a_list)

commacode(spam)

当然，输出只是列表值.我试图将第5行设为print(str(a_list))，但这会产生语法错误.我的思路是必须将其更改为字符串，但我迷路了.我在本章中遗漏了什么吗?我觉得自己已经经历了几次.我觉得len(a_list)应该在其中某处，但这只会为我提供5的值.任何想法，或者我应该如何考虑这一点都会有很大的帮助.我总是觉得我真的很了解这些东西，然后我进入了这些练习项目，并且总是对要做的事情感到困惑.我知道练习项目将使用我们在前几章中学到的一些信息，然后将重点主要放在当前的章节上.第4章仅列出几个例子，包括列表，列表值，字符串值，元组，copy.copy()和copy.deepcopy().

And of course the output is just the list values. I've tried to make line 5 as print(str(a_list)), but that gives a syntax error. My line of thinking is that I have to change it to a string, but I'm lost. Am I missing something in the chapter? I've felt like I've gone over it several times. I feel like len(a_list) should be somewhere in there but that would just give me a value of 5. Any thoughts, or how I should go about thinking about this would be great help. I always feel like I'm really understanding this stuff and then I get to these practice projects and am ALWAYS confused on what to do. I know the practice projects are going to use some information we've learned in previous chapters and then focus mainly on the chapter we are on. Chapter 4 covers lists, list values, string values, tuples, copy.copy(), and copy.deepcopy() just to name a few.

链接-第4章

推荐答案

这是我对解决方案的看法.它利用了我们在本章中学到的所有知识.

Here's my take on the solution. It utilizes everything we have learned through this chapter.

def pr_list(listothings):

    for i in range(len(listothings)-1):
        print(listothings[i] + ', ', end='')

spam = ['apples', 'bananas', 'tofu', 'cats']

pr_list(spam)

print('and ' + spam[-1])

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