From the doc: http://docs.python.org/2/reference/lexical_analysis.html
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).
If it’s a raw string, then the backslash will
not escape the
following quote character. Ergo r”\” should be allowed.
Regards,
Scot Kelly
“Be excellent to each other.”
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