python3.0 raw string疑问

[bearnedzq]

python3.0 raw string疑问

我想用raw string表达 abc\

>>> r = r'abc\'
SyntaxError: EOL while scanning string literal
>>> r = r'abc\''
>>> print(r)
abc\'

结果python不是很聪明，在raw string里\还是表现出转义的功能。
后面要再加上一个'，才是合法的字符串。可是这样，已经不是我要的结果了。

怎样用 raw string 表达出 abc\ ？
结论似乎是不可能，非得用 r = 'abc\\' 这样丑陋的方式
看来 raw string 还得再改进才成

[feilniu]

http://docs.python.org/py3k/reference/lexical_analysis.html#literals

Even in a raw string, string quotes can be escaped with a backslash, but the backslash remains in the string; for example, r"\"" is a valid string literal consisting of two characters: a backslash and a double quote; r"\" is not a valid string literal (even a raw string cannot end in an odd number of backslashes). Specifically, a raw string cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.

http://hongqn.livejournal.com/13175.html

[I_NBFA]

Even in a raw string, string quotes can be escaped with a backslash, but the backslash remains in the string; for example, r"\"" is a valid string literal consisting of two characters: a backslash and a double quote; r"\" is not a valid string literal (even a raw string cannot end in an odd number of backslashes). Specifically, a raw string cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.

python文档里写的很清楚rawstring会识别引号转义但原样保留字符，所以不能以\结尾。
解决办法很简单，r"abc" + '\\'