python - 有没有什么方法可以在字符串之间添加而不将字符串更改为列表 - 或者字符串是不可变的？

Question

我是Python初学者，正在做一些简单的问题。但是，我遇到了以下问题:

Define a simple "spelling correction" function correct() that takes a string and sees to it that:

1) two or more occurrences of the space character is compressed into one, and

2) inserts an extra space after a period if the period is directly followed by a letter. E.g. correct("This (multiple spaces) is (multiple spaces) very funny (multiple spaces) and (multiple spaces) cool.Indeed!") should return "This is very funny and cool. Indeed!"

Tip: Use regular expressions!

这是我的代码:

def correct(x):
    y = x.split()
    y = list(y)
    for i in y:
        if i == " ":
            for o in y:
                if o == " ":
                    y.remove(o)
        y.insert(y.index(i)," ")
        if i == ".":
            y.insert(y.index(i)+1," ")
    y = " ".join(y)
    return y

print(correct("This   is  very funny  and    cool.Indeed!"))

当我运行该程序时，没有任何输出。我不知道我做错了什么。是否有其他方法可以在字符串之间添加而不将字符串更改为列表？或者字符串是不可变的？

Answer 1

@ John La Rooy，也许你的代码更短......我认识自己，我没有看到你的答案，我不会完成......，你是主人......

def correct(s):
    s = raw_input("Please give a sentece: ")
    return " ".join(s.replace(".", ". ").split())
print correct('s')