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Fix invalid escape sequence SyntaxWarning for '\#' #307
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In the test file
testlex.py, at line 193, on newer Python versions (3.12+), a SyntaxWarning is emitted when an invalid escape sequence is encountered, just like this:This PR changes the line to use a raw string for this. Raw strings were supported even in Python 2.7, so there is no problem here. See https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals