python - Python 3.6：在字符串中移动单词

Question

我知道这个函数在字符串中的字符周围移动，例如：

def swapping(a, b, c):
    x = list(a)
    x[b], x[c] = x[c], x[b]
    return ''.join(x)

这允许我这样做：

swapping('abcde', 1, 3)
'adcbe'
swapping('abcde', 0, 1)
'bacde'

但是我怎样才能让它做这样的事情，所以我不只是在字母周围移动？这就是我想要完成的：

swapping("Boys and girls left the school.", "boys", "girls")
swapping("Boys and girls left the school.", "GIRLS", "bOYS")
should both have an output: "GIRLS and BOYS left the school." 
# Basically swapping the words that are typed out after writing down a string

标签： pythonpython-3.x

Answer 1

你可以这样做：

def swap(word_string, word1, word2):
    words = word_string.split()
    try:
        idx1 = words.index(word1)
        idx2 = words.index(word2)
        words[idx1], words[idx2] = words[idx2],words[idx1]
    except ValueError:
        pass
    return ' '.join(words)