Deprecation warning due to invalid escape sequences

[tirkarthi]

Deprecation warnings are raised due to invalid escape sequences. This can be fixed by using raw strings or escaping the literals. pyupgrade also helps in automatic conversion : https://github.com/asottile/pyupgrade/ . They seemed to have been silenced in pylint but they raise deprecation warning in 3.7.0 and above.

Expected results

No warnings

Actual results

Deprecation warnings are raised

How to reproduce the bug

 find . -iname '*.py' | xargs -P4 -I{} python3.10 -Wall -m py_compile {}
./superset/models/helpers.py:49: DeprecationWarning: invalid escape sequence \]
  ",[ \t\r\n]+\]", "]", val  # pylint: disable=anomalous-backslash-in-string
./superset/config.py:149: DeprecationWarning: invalid escape sequence \e
  "\2\1thisismyscretkey\1\2\e\y\y\h"  # pylint: disable=anomalous-backslash-in-string

Environment

(please complete the following information):

• superset version: master branch
• python version: 3.8
• node.js version: node -v
• npm version: npm -v

Checklist

Make sure these boxes are checked before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

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