Python中的取消转义字符串

Question

我有一个输入文件，其中包含一个输入列表，每一行一个。每一行输入都用双引号括起来。输入有时有反斜杠或几个双引号，如包围双引号(请参阅下面的示例)。

样本输入-

"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\"\\\\\\"

我想接受上面的输入，并简单地将行中转义双引号的输入转换为回勾`。

我假设有一个简单的单行解决方案。我试过以下几种方法，但不起作用。任何其他一条龙解决方案或对以下代码的修复将不胜感激。

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

它对输入第3行和第5行失败。

"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`\\\\\`

我能想到的任何解决办法都会打断其他线路。请帮帮我！

Answer 1

这并不完全是您所要求的，因为它代替了"而不是, but I'll mention it ... you could always leverage offcsvto do\‘转换：

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

如果它们是实际的's, you could simply do a replace on the text returned by thecsv` `模块很重要的话。

Answer 2

在反斜杠后添加+。

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