在Python中的字符串中处理转义序列 [英] Process escape sequences in a string in Python

问题描述

有时，当我从文件或用户获取输入时，我会得到一个带有转义序列的字符串。我想处理转义序列的方式与Python处理字符串中的转义序列相同文字。

Sometimes when I get input from a file or the user, I get a string with escape sequences in it. I would like to process the escape sequences in the same way that Python processes escape sequences in string literals.

例如，假设 myString 定义为：

>>> myString = "spam\\neggs"
>>> print(myString)
spam\neggs

我想要一个函数（我会调用它进程）执行此操作：

I want a function (I'll call it process) that does this:

>>> print(process(myString))
spam
eggs

重要的是函数可以处理Python中的所有转义序列（在上面链接的表中列出）。

It's important that the function can process all of the escape sequences in Python (listed in a table in the link above).

Python是否具有这样的功能？

Does Python have a function to do this?

推荐答案

正确的做法是使用'string-escape'代码解码字符串。

The correct thing to do is use the 'string-escape' code to decode the string.

>>> myString = "spam\\neggs"
>>> decoded_string = bytes(myString, "utf-8").decode("unicode_escape") # python3 
>>> decoded_string = myString.decode('string_escape') # python2
>>> print(decoded_string)
spam
eggs

不要使用AST或EVAL。使用字符串编解码器更安全。

Don't use the AST or eval. Using the string codecs is much safer.

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