Deprecation warning due to invalid escape sequences in Python 3.8

Deprecation warnings are raised due to invalid escape sequences in Python 3.8 . Below is a log of the warnings raised during compiling all the python files. Using raw strings or escaping them will fix this issue.

find . -iname '*.py'  | xargs -P 4 -I{} python -Wall -m py_compile {}

./azure-devops/azure/devops/v6_0/feed/models.py:101: DeprecationWarning: invalid escape sequence \,
  """
./azure-devops/azure/devops/v6_0/feed/models.py:224: DeprecationWarning: invalid escape sequence \,
  """
./azure-devops/azure/devops/v6_0/feed/models.py:1080: DeprecationWarning: invalid escape sequence \,
  """
./azure-devops/azure/devops/v5_1/feed/models.py:101: DeprecationWarning: invalid escape sequence \,
  """
./azure-devops/azure/devops/v5_1/feed/models.py:220: DeprecationWarning: invalid escape sequence \,
  """
./azure-devops/azure/devops/v5_1/feed/models.py:1049: DeprecationWarning: invalid escape sequence \,

首先執行所示的 find/xargs Python 3.8 編譯命令，並檢查 azure-devops/azure/devops/v6_0/feed/models.py 和 v5_1/feed/models.py 中的警告位置。更新受影響的字串字面值，讓無效逸出警告消失，然後在 Python 檔案上重新執行該命令，以確認結果乾淨。