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"invalid escape sequence" DeprecationWarnings with Python 3.6 #646

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The-Compiler opened this issue Jan 8, 2017 · 4 comments
Closed

"invalid escape sequence" DeprecationWarnings with Python 3.6 #646

The-Compiler opened this issue Jan 8, 2017 · 4 comments

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@The-Compiler
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@The-Compiler The-Compiler commented Jan 8, 2017

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.

@ThiefMaster
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@ThiefMaster ThiefMaster commented Jan 8, 2017

I think those strings should be r'...' raw strings to avoid exactly such warnings

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@ThiefMaster
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@ThiefMaster ThiefMaster commented Jan 8, 2017

FWIW, I don't think any \ is needed for the - - outside [] the dash has no special meaning.

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@mitsuhiko mitsuhiko closed this in be16786 Jan 8, 2017
@MartinThoma
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@MartinThoma MartinThoma commented Nov 19, 2018

pip3 install jinja --user --upgrade solved it for me.

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@abrahamrhoffman
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@abrahamrhoffman abrahamrhoffman commented Oct 25, 2019

raw string conversion ftw! I came here looking for a solution to my linting problems :) thanks for the tip!

r"awk -F\my_string '{print $1}'"

not

"awk -F\my_string '{print $1}'"

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apriha added a commit to apriha/snps that referenced this issue Jun 5, 2020
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4 participants