code: def exception_colors():
      """Return a color table with fields for exception reporting.
  
      The table is an instance of ColorSchemeTable with schemes added for
      'Neutral', 'Linux', 'LightBG' and 'NoColor' and fields for exception handling filled
      in.
  
      Examples:
  
      >>> ec = exception_colors()
      >>> ec.active_scheme_name
      ''
      >>> print(ec.active_colors)
      None
  
      Now we activate a color scheme:
      >>> ec.set_active_scheme('NoColor')
      >>> ec.active_scheme_name
      'NoColor'
      >>> sorted(ec.active_colors.keys())
      ['Normal', 'caret', 'em', 'excName', 'filename', 'filenameEm', 'line',
      'lineno', 'linenoEm', 'name', 'nameEm', 'normalEm', 'topline', 'vName',
      'val', 'valEm']
      """
  
      ex_colors = ColorSchemeTable()
  
      # Populate it with color schemes
      C = TermColors  # shorthand and local lookup
      ex_colors.add_scheme(
          ColorScheme(
              "NoColor",
              # The color to be used for the top line
              topline=C.NoColor,
              # The colors to be used in the traceback
              filename=C.NoColor,
              lineno=C.NoColor,
              name=C.NoColor,
              vName=C.NoColor,
              val=C.NoColor,
              em=C.NoColor,
              # Emphasized colors for the last frame of the traceback
              normalEm=C.NoColor,
              filenameEm=C.NoColor,
              linenoEm=C.NoColor,
              nameEm=C.NoColor,
              valEm=C.NoColor,
              # Colors for printing the exception
              excName=C.NoColor,
              line=C.NoColor,
              caret=C.NoColor,
              Normal=C.NoColor,
          )
      )
  
      # make some schemes as instances so we can copy them for modification easily
      ex_colors.add_scheme(
          ColorScheme(
              "Linux",
              # The color to be used for the top line
              topline=C.LightRed,
              # The colors to be used in the traceback
              filename=C.Green,
              lineno=C.Green,
              name=C.Purple,
              vName=C.Cyan,
              val=C.Green,
              em=C.LightCyan,
              # Emphasized colors for the last frame of the traceback
              normalEm=C.LightCyan,
              filenameEm=C.LightGreen,
              linenoEm=C.LightGreen,
              nameEm=C.LightPurple,
              valEm=C.LightBlue,
              # Colors for printing the exception
              excName=C.LightRed,
              line=C.Yellow,
              caret=C.White,
              Normal=C.Normal,
          )
      )
  
      # For light backgrounds, swap dark/light colors
      ex_colors.add_scheme(
          ColorScheme(
              "LightBG",
              # The color to be used for the top line
              topline=C.Red,
              # The colors to be used in the traceback
              filename=C.LightGreen,
              lineno=C.LightGreen,
              name=C.LightPurple,
              vName=C.Cyan,
              val=C.LightGreen,
              em=C.Cyan,
              # Emphasized colors for the last frame of the traceback
              normalEm=C.Cyan,
              filenameEm=C.Green,
              linenoEm=C.Green,
              nameEm=C.Purple,
              valEm=C.Blue,
              # Colors for printing the exception
              excName=C.Red,
              # line = C.Brown,  # brown often is displayed as yellow
              line=C.Red,
              caret=C.Normal,
              Normal=C.Normal,
          )
      )
  
      ex_colors.add_scheme(
          ColorScheme(
              "Neutral",
              # The color to be used for the top line
              topline=C.Red,
              # The colors to be used in the traceback
              filename=C.LightGreen,
              lineno=C.LightGreen,
              name=C.LightPurple,
              vName=C.Cyan,
              val=C.LightGreen,
              em=C.Cyan,
              # Emphasized colors for the last frame of the traceback
              normalEm=C.Cyan,
              filenameEm=C.Green,
              linenoEm=C.Green,
              nameEm=C.Purple,
              valEm=C.Blue,
              # Colors for printing the exception
              excName=C.Red,
              # line = C.Brown,  # brown often is displayed as yellow
              line=C.Red,
              caret=C.Normal,
              Normal=C.Normal,
          )
      )
  
      # Hack: the 'neutral' colours are not very visible on a dark background on
      # Windows. Since Windows command prompts have a dark background by default, and
      # relatively few users are likely to alter that, we will use the 'Linux' colours,
      # designed for a dark background, as the default on Windows.
      if os.name == "nt":
          ex_colors.add_scheme(ex_colors["Linux"].copy("Neutral"))
  
      return ex_colors
  
file_path: catboost/contrib/python/ipython/py2/IPython/core/excolors.py
imports: import os
  import warnings
  from IPython.utils.coloransi import ColorSchemeTable, TermColors, ColorScheme
label_desc: Use image node_id 1 for calling a global function with example usage: exception_colors() and returns: ex_colors