Python 合并三个单引号之间的行，然后将起始引号替换为'#'；

所需输出：

'''
Created on Mar 11, 2017

@author: XXZ
This file is to demonstrate the word frequency counter. This is a very 
important practical

'''

（我想把它算作评论）

我的代码： 进口稀土

#Created on Mar 11, 2017 @author: XXZ This file is to demonstrate the word frequency counter. This is a very important practical

---

这只是在文件中写入最后一条多行注释。并非全部。

您可以使用

re.sub

将一行或多行新行（

\n

）替换为单个空格。然后去掉结果（任何尾随空格和前导空格），并将其连接到一个

“#”

：

---

将

\n

替换为

。下面是一个代码：

import re
'#' + re.sub('\n+',' ',s).strip()
#'#Created on Mar 11, 2017 @author: XXZ This file is to demonstrate the word frequency counter. This is a very  important practical'

输出：

a = '''
Created on Mar 11, 2017

@author: XXZ
This file is to demonstrate the word frequency counter. This is a very 
important practical

'''

print("#"+a.replace("\n"," "))

---

使用

str.join

Ex:

# Created on Mar 11, 2017  @author: XXZ This file is to demonstrate the word frequency counter. This is a very  important practical  

s = '''
Created on Mar 11, 2017

@author: XXZ
This file is to demonstrate the word frequency counter. This is a very 
important practical

'''
print("# "+ " ".join(i.strip() for i in s.split()) )

输出：

# Created on Mar 11, 2017  @author: XXZ This file is to demonstrate the word frequency counter. This is a very  important practical  

s = '''
Created on Mar 11, 2017

@author: XXZ
This file is to demonstrate the word frequency counter. This is a very 
important practical

'''
print("# "+ " ".join(i.strip() for i in s.split()) )

---

您可以在中读取整个文件，并在多行模式下应用

re.sub

。 之后（或之前，不要紧…）只需裁剪这三个

，

并添加

。

：

---

你试过什么，你坚持什么？为什么输出在字频计数器前会出现分裂？它没有分裂，应该在同一行。你为什么要这样做？与docstring不同，注释不可用于

帮助

等。它们不仅仅是注释。它们是文档字符串。也许给问题添加一些真实的上下文会有帮助？正确，即使我将

'\n'

替换为

'\s'

，这样两行就不会靠得太近……它不会将两行连在一行中。@nehaj现在看到答案了；这和你想要的不完全一样吗？它把“#”放在每行的前面。但不会将行连接成一行。不，不会，它会删除所有行，因此根据定义，结果只有一行。谢谢它工作了。你能解释一下“flags=re.MULTILINE”通常是逐行工作的，所以你不能匹配换行符。此模式使

re

将整个文本作为一个块处理。另见

import re
with open('test.py', 'r') as f:
    txt = f.read()
    print('IN:\n', txt)
    txt = re.sub('\n', ' ', txt, flags=re.MULTILINE)
    txt = '#' + txt[3:-3]
    print('\nOUT:\n',txt)


IN:
 '''
Created on Mar 11, 2017

@author: XXZ
This file is to demonstrate the word frequency counter. This is a very 
important practical

'''

OUT:
 # Created on Mar 11, 2017  @author: XXZ This file is to demonstrate the word frequency counter. This is a very  important practical