替换列表中索引k之后的每个单词 [英] Replace every word after index k in list

问题描述

如何替换列表中索引[3]之后的每个单词?

How do you replace every word after index[3] in list?

例如，我需要将第一个单词更改为"how's"，将第二个单词更改为"it"，将第三个单词更改为"going?".然后，我需要将索引[3]之后的每个单词更改为"yo":

For example, I need to change first word to "How's" and second word to "it" and third word to "going?". Then, I need to change every word to "yo" after index[3]:

input = "My name is bla bla bla?" 

output = "How's it going? Yo! Yo! Yo!"

这是我到目前为止所拥有的:

This is what I have so far:

def hellohello(input):
    if type(input) != str:
        return "Input has to be string"
    else:
        new_input = input.split(' ')
        if len(input) <= 3:
            return "How's it going?"
        else:
            new_input[0] = "How's "
            new_input[1] = "it "
            new_input[2] = "going? "
            new_input[3:] = ["Yo! "]
            output = ''.join(new_input)
            return output

print hellohello("why is this not printing more yo")

到目前为止，我只得到:

So far I only get:

How's it going? Yo!

推荐答案

尝试一下:

def hellohello(input):
    if type(input) != str:
        return "Input has to be string"
    else:
        new_input = input.split(' ')
        if len(input) <= 3:
            return "How's it going?"
        else:
            new_input[0] = "How's"
            new_input[1] = "it"
            new_input[2] = "going?"
            for currentIndex in xrange(3, len(new_input)):
                new_input[currentIndex] = "Yo!"
            output = ' '.join(new_input)
            return output

print hellohello("why is this not printing more yo")
print hellohello("why is this")
print hellohello("why is this yep")

输出:

How's it going? Yo! Yo! Yo! Yo!
How's it going?
How's it going? Yo!

通过执行new_input[3:] = ["Yo! "]，您只需用单个字符串"Yo！"替换从索引3到最后一个索引的所有字符串标记的子数组(在由split分隔的数组中)，而不是替换每个数组项目本身.基本上，您引用了数组的整个切片(3:)而不是单个项目.

By executing new_input[3:] = ["Yo! "], you simply replaced the subarray of all string tokens (in the array separated by split) from index 3 to the last index with a single string, "Yo!", instead of replacing each array item by itself. Basically, you referenced an entire slice of the array (3:) instead of just a single item.

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