Python中的Unescape字符串

Question

我有一個包含輸入列表的輸入文件，每行一個。每行輸入都用雙引號括起來。輸入有時會在封閉的雙引號內使用反斜槓或少量雙引號（請查看下面的示例）。

樣品輸入 -

"each line is enclosed in double-quotes" 
"Double quotes inside a \"double-quoted\" string!" 
"This line contains backslashes \\not so cool\\" 
"too many double-quotes in a line \"\"\"too much\"\"\"" 
"too many backslashes \\\\\\\"horrible\"\\\\\\" 

我想借上述輸入和簡單地在線路逃脫雙引號的那些轉換爲回剔`。

我假設有一個簡單的單線解決方案。我嘗試了以下，但它不起作用。任何其他單線解決方案或修復下面的代碼將不勝感激。

def fix(line): 
    return re.sub(r'\\"', '`', line) 

它未能對輸入線和。

"each line is enclosed in double-quotes" 
"Double quotes inside a `double-quoted` string!" 
"This line contains backslashes \\not so cool\` 
"too many double-quotes in a line ```too much```" 
"too many backslashes \\\\\\`horrible`\\\\\` 

我能想到的任何修補程序都會打破其他行。請幫忙！

Answer 1

這是不太你要的，因爲它與"而不是'代替，但我會提到它......你總是可以利用關csv做\"轉換爲您正確：

>>> for line in csv.reader(["each line is enclosed in double-quotes", 
...       "Double quotes inside a \"double-quoted\" string!", 
...       "This line contains backslashes \\not so cool\\", 
...       "too many double-quotes in a line \"\"\"too much\"\"\"", 
...       "too many backslashes \\\\\\\"horrible\"\\\\\\", 
...       ]): 
...   print(line) 
...  
['each line is enclosed in double-quotes'] 
['Double quotes inside a "double-quoted" string!'] 
['This line contains backslashes \\not so cool\\'] 
['too many double-quotes in a line """too much"""'] 
['too many backslashes \\\\\\"horrible"\\\\\\'] 

如果重要的是它們是實際的，那麼您可以簡單地替換csv模塊返回的文本。

Answer 2

在反斜槓後加+。

return re.sub(r'\\+"', '`', line)