使用 Python 反转句子中的单词？

Question

我正在尝试反转句子中的单词。

for example:

arr = [ 'p', 'e', 'r', 'f', 'e', 'c', 't', '  ',
        'm', 'a', 'k', 'e', 's', '  ',
        'p', 'r', 'a', 'c', 't', 'i', 'c', 'e' ]

should be

[ 'p', 'r', 'a', 'c', 't', 'i', 'c', 'e', '  ',
  'm', 'a', 'k', 'e', 's', '  ',
  'p', 'e', 'r', 'f', 'e', 'c', 't' ]

我写了下面的代码，先反转整个数组然后反转每个单词

def reverse_words(arr):

  def mirrorReverse(arr,start,end):
    while(start<end):
      tmp=arr[start]
      arr[start]=arr[end]
      arr[end]=tmp
      start+=1
      end-=1

  n=len(arr)
  mirrorReverse(arr,0,n-1)

  for i in range(len(arr)):
    if arr[i]=='  ' and start==0: #first word
      mirrorReverse(arr,start,i-1)
      start=i+1
    elif i==len(arr)-1: #last word  
      mirrorReverse(arr,start,i)

    elif arr[i]=='  ' and start!=None: #middle
        mirrorReverse(arr,start,i-1)
        start=i+1

  return arr

这工作正常并输出所需的答案但是当我使用不同的例子时它不起作用：

test 1: ["a"," "," ","b"]

Expected: ["b"," "," ","a"]

Actual: ['a', ' ', ' ', 'b']

test2: ["y","o","u"," ","w","i","t","h"," ","b","e"," ","f","o","r","c","e"," ","t","h","e"," ","m","a","y"]

output: ['y', 'o', 'u', ' ', 'w', 'i', 't', 'h', ' ', 'b', 'e', ' ', 'f', 'o', 'r', 'c', 'e', ' ', 't', 'h', 'e', ' ', 'm', 'a', 'y']

尽管 test2 与上面的主要示例相似，但效果非常好。任何帮助

Answer 1

首先，在 Python 提示符下：

>>> def revwords(str):
...    list = str.split()
...    list.reverse()
...    return ' '.join(list)
... 
>>> revwords('The quick brown fox jumped over the lazy dogs.')
'dogs. lazy the over jumped fox brown quick The'

通过进行一些重组和拆分，我们可以将上述内容与所需的字符数组表示形式结合使用。在 Python 提示符处继续：

>>> list(revwords(''.join(['H', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'])))
['w', 'o', 'r', 'l', 'd', ' ', 'H', 'e', 'l', 'l', 'o']

Answer 2

请针对您的具体情况尝试以下解决方案：

if __name__ == "__main__":
    x = ['p', 'e', 'r', 'f', 'e', 'c', 't', '', 'm', 'a', 'k', 'e', 's', '', 'p', 'r', 'a', 'c', 't', 'i', 'c', 'e']
    words = []
    word = ""
    for letter in x:
        if len(letter) == 1:
            word += letter
        else:
            words.append(word)
            word = ""
    words.append(word)  # add the last one
    result = []
    for w in words[::-1]:
        for letter in w:
            result.append(letter)
        result.append("")

    result.pop()  # remove the last one ""
    print(result)

Answer 3

Here is one way of reversing a sentence joining:

sentence = "perfect makes practice"
s_list = sentence.split(" ")
s_list.reverse()
print(" ".join(s_list))

Answer 4

您的代码看起来没问题。您的示例中有双白色 space，而 code.Test 情况下有单白色 space。当我复制粘贴您的代码并将 if's 中的双白 spaces 更改为单白 space 时，一切正常。

使用 Python 反转句子中的单词？

reverse words in a sentence using Python?

python

string

word