考虑到标点符号，如何反转字符串中的单词？

Question

这是我目前的情况：

def reversestring(thestring):
    words = thestring.split(' ')
    rev = ' '.join(reversed(words))
    return rev

stringing = input('enter string: ')
print(reversestring(stringing))

我知道我遗漏了一些东西，因为我需要标点符号来遵循逻辑。

所以假设用户输入 Do or do not, there is no try.。结果应该是 .try no is there , not do or Do，但我只得到 try. no is there not, do or Do。我使用一个简单的实现来反转字符串中的所有字符，然后做一些检查所有单词并再次反转字符的操作，但仅限于具有字母 ASCII 值的字符。

Answer 1

您的代码完全按照其应有的方式执行，在 space 上拆分不会将点 ro 逗号与单词分隔开。

我建议您使用 re.findall 来获取您感兴趣的所有单词和所有标点符号

import re
def reversestring(thestring):
    words = re.findall(r"\w+|[.,]", thestring)
    rev = ' '.join(reversed(words))
    return rev

reversestring("Do or do not, there is no try.")  # ". try no is there , not do or Do"

Answer 2

试试这个（代码注释中的解释）：

s = "Do or do not, there is no try."

o = []
for w in s.split(" "):
  puncts = [".", ",", "!"] # change according to needs
  for c in puncts:
    # if a punctuation mark is in the word, take the punctuation and add it to the rest of the word, in the beginning
    if c in w:
      w = c + w[:-1] # w[:-1] gets everthing before the last char
  
  o.append(w)
  

o = reversed(o) # reversing list to reverse sentence
print(" ".join(o)) # printing it as sentence


#output: .try no is there ,not do or Do

Answer 3

您可以使用正则表达式将句子解析为单词列表和分隔符列表，然后将单词列表反转并组合在一起形成所需的字符串。您的问题的解决方案如下所示：

import re

def reverse_it(s):
    t = "" # result, empty string
    words = re.findall(r'(\w+)', s) # just the words
    not_s = re.findall(r'(\W+)', s) # everything else
    j = len(words)
    k = len(not_s)
    words.reverse() # reverse the order of word list
    if re.match(r'(\w+)', s): # begins with a word
        for i in range(k):
            t += words[i] + not_s[i]
        if j > k: # and ends with a word
            t += words[k]
    else: # begins with punctuation
        for i in range(j):
            t += not_s[i] + words[i]
        if k > j: # ends with punctuation
            t += not_s[j]
    return t #result

def check_reverse(p):
    q = reverse_it(p)
    print("\"%s\", \"%s\"" % (p, q) )

check_reverse('Do or do not, there is no try.')

输出

"Do or do not, there is no try.", "try no is there, not do or Do."

这不是一个非常优雅的解决方案，但确实有效！

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考虑到标点符号，如何反转字符串中的单词？