[Python-ideas] Make undefined escape sequences have SyntaxWarnings

[Yuval Greenfield]

http://docs.python.org/release/3.3.0/reference/lexical_analysis.html#string-and-bytes-literals

I'm not sure I understand what this line from the docs means:

\newline Backslash and newline ignored

I understand that row as either "\n" won't appear in the resulting string
or that I should get "\\newline".

Yuval Greenfield
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