我知道这个函数在字符串中围绕字符移动,如下所示:
def swapping(a, b, c):
x = list(a)
x[b], x[c] = x[c], x[b]
return ''.join(x)这让我可以这么做:
swapping('abcde', 1, 3)
'adcbe'
swapping('abcde', 0, 1)
'bacde'但我怎么能让它做这样的事情,所以我不只是在移动字母?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发布于 2018-05-14 20:16:08
使用正则表达式和替换函数(可以使用lambda和双三元函数完成,但这并不是真正的可读性)
匹配所有单词(\w+),并与两个单词(大小写不敏感)进行比较。如果发现,返回“相反的”字。
import re
def swapping(a,b,c):
def matchfunc(m):
g = m.group(1).lower()
if g == c.lower():
return b.upper()
elif g == b.lower():
return c.upper()
else:
return m.group(1)
return re.sub("(\w+)",matchfunc,a)
print(swapping("Boys and girls left the school.", "boys", "girls"))
print(swapping("Boys and girls left the school.", "GIRLS", "bOYS"))两种打印:GIRLS and BOYS left the school.
发布于 2018-05-14 19:19:28
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)发布于 2018-05-14 19:19:27
使用split函数获取由whitespaces分隔的单词列表
def swapping(a, b, c):
x = a.split(" ")
x[b], x[c] = x[c], x[b]
return ' '.join(x)如果希望将字符串作为参数传递,请使用.index()获取要交换的字符串的索引。
def swapping(a, b, c):
x = a.split(" ")
index_1 = x.index(b)
index_2 = x.index(c)
x[index_2], x[index_1] = x[index_1], x[index_2]
return ' '.join(x)https://stackoverflow.com/questions/50337468
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