在Python中取消轉義字符串

Question

我有一個輸入文件，其中包含輸入列表，每行一個。 輸入的每一行都用雙引號引起來。 輸入有時會包含反斜杠或一些雙引號，如括在雙引號內（請參見下面的示例）。

樣本輸入—

"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\"\\\\\\"

我想接受以上輸入並將行中帶有轉義雙引號的輸入轉換為反引號` 。

我認為對此有一個簡單的單線解決方案。 我嘗試了以下操作，但不起作用。 任何其他單線解決方案或對以下代碼的修復將不勝感激。

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

輸入線路3和5失敗。

"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`\\\\\`

我能想到的任何修復方法都會破壞其他方面。 請幫忙！

Answer 1

這不是您所要求的，因為它被替換為"而不是`，但是我會提到它……您始終可以利用csv為您正確地進行\\"轉換：

>>> 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"\\\\\\']

如果很重要的一點是要讓它們成為實際的`，可以簡單地對csv模塊返回的文本進行替換。

Answer 2

在反斜杠后添加+ 。

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