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/

This is emitted in Python 3.7 and above. Below command is the log of the files with warnings in Python 3.8

 find . -iname '*.py' | grep -v example | xargs -P4 -I{} python3.8 -Wall -m py_compile {}
./pyclustering/nnet/sync.py:338: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/nnet/sync.py:381: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/nnet/sync.py:782: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/nnet/fsync.py:167: DeprecationWarning: invalid escape sequence \d
  """!
./pyclustering/utils/sampling.py:73: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/utils/metric.py:314: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/utils/metric.py:350: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/utils/metric.py:386: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/utils/metric.py:424: DeprecationWarning: invalid escape sequence \m
  """!
./pyclustering/utils/metric.py:464: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/utils/metric.py:502: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/utils/metric.py:546: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/utils/metric.py:588: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/utils/__init__.py:285: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/cluster/xmeans.py:314: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/cluster/silhouette.py:46: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/cluster/gmeans.py:259: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/cluster/gmeans.py:349: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/cluster/center_initializer.py:111: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/cluster/birch.py:36: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/cluster/fcm.py:36: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/cluster/elbow.py:38: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/cluster/bsas.py:78: DeprecationWarning: invalid escape sequence \l
  """!
./pyclustering/cluster/kmedians.py:221: DeprecationWarning: invalid escape sequence \s
  """!
./pyclustering/cluster/kmeans.py:495: DeprecationWarning: invalid escape sequence \s
  """!
./ccore/tst/ut-runner.py:69: DeprecationWarning: invalid escape sequence \[
  expression_failure = re.compile("\[\s+FAILED\s+\] (\S+)\.(\S+)")