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Deprecation warnings due to invalid escape sequences in python 3.8 #853

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Deprecation warnings due to invalid escape sequences in python 3.8#853
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bug
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release-0.20
@tirkarthi

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@tirkarthi
tirkarthi
opened on Oct 11, 2020
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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/

I will raise a PR for this

find . -iname '*.py' | xargs -P4 -I{} python3 -Wall -m py_compile {} 
./bpython/line.py:193: DeprecationWarning: invalid escape sequence \s
  current_method_definition_name_re = LazyReCompile("def\s+([a-zA-Z_][\w]*)")
./bpython/cli.py:943: DeprecationWarning: invalid escape sequence \T
  elif key in ("KEY_NPAGE", "\T"):  # page_down or \T
./bpython/cli.py:947: DeprecationWarning: invalid escape sequence \S
  elif key in ("KEY_PPAGE", "\S"):  # page_up or \S
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