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"invalid escape sequence" DeprecationWarnings with Python 3.6 #646

@The-Compiler

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@The-Compiler

I get these while running my project's testsuite with all warnings turned on and Python 3.6:

.../jinja2/nodes.py:716: DeprecationWarning: invalid escape sequence \s
         """
       
.../jinja2/runtime.py:111: DeprecationWarning: invalid escape sequence \s
         """
       
.../jinja2/lexer.py:294: DeprecationWarning: invalid escape sequence \s
         """
       
.../jinja2/lexer.py:503: DeprecationWarning: invalid escape sequence \-
         (c('(?:\-%s\s*|%s)%s' % (
       
.../jinja2/lexer.py:511: DeprecationWarning: invalid escape sequence \-
         (c('\-%s\s*|%s' % (
       
.../jinja2/lexer.py:518: DeprecationWarning: invalid escape sequence \s
         (c('(.*?)((?:\s*%s\-|%s)\s*endraw\s*(?:\-%s\s*|%s%s))' % (

It looks like it's mostly \s in (non-raw) docstrings and \- in regexes. For some odd reason I can't reproduce this when running pylint's testsuite with pytest-warnings though, so I don't know if there's more.

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