I want to convert strings containing escaped characters to their normal form, the same way Python’s lexical parser does:
'One \'example\'' print(escaped_str) One 'Example' >>> normal_str = normalize_str(escaped_str) >>> print(normal_str) One 'Example'escaped_str =
Of course the boring way will be to replace all known escaped characters one by one:
How would you implement
normalize_str() in the above code?
>>> escaped_str = 'One \'example\'' >>> print escaped_str.encode('string_escape') One \'example\' >>> print escaped_str.decode('string_escape') One 'example'
Several similar codecs are available, such as rot13 and hex.
The above is Python 2.x, but – since you said (below, in a comment) that you’re using Python 3.x – while it’s circumlocutious to decode a Unicode string object, it’s still possible. The codec has been renamed to “unicode_escape” too:
Python 3.3a0 (default:b6aafb20e5f5, Jul 29 2011, 05:34:11) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> escaped_str = "One \'example\'" >>> import codecs >>> print(codecs.getdecoder("unicode_escape")(escaped_str)) One 'example'
I assume the question is really:
I have a string that is formatted as if it were a part of Python source code. How can I safely interpret it so that
nwithin the string is transformed into a newline, quotation marks are expected on either end, etc. ?
"hi, mom.n This is a "weird"" string, isn't it?""