class_docstr: the OS/2 table
class_docstr_tok: ["the","OS\/2","table"]
code: def toXML(self, writer, ttFont):
      writer.comment(
          "The fields 'usFirstCharIndex' and 'usLastCharIndex'\n"
          "will be recalculated by the compiler"
      )
      writer.newline()
      if self.version == 1:
          format = OS2_format_1
      elif self.version in (2, 3, 4):
          format = OS2_format_2
      elif self.version == 5:
          format = OS2_format_5
      else:
          format = OS2_format_0
      formatstring, names, fixes = sstruct.getformat(format)
      for name in names:
          value = getattr(self, name)
          if name == "panose":
              writer.begintag("panose")
              writer.newline()
              value.toXML(writer, ttFont)
              writer.endtag("panose")
          elif name in (
              "ulUnicodeRange1",
              "ulUnicodeRange2",
              "ulUnicodeRange3",
              "ulUnicodeRange4",
              "ulCodePageRange1",
              "ulCodePageRange2",
          ):
              writer.simpletag(name, value=num2binary(value))
          elif name in ("fsType", "fsSelection"):
              writer.simpletag(name, value=num2binary(value, 16))
          elif name == "achVendID":
              writer.simpletag(name, value=repr(value)[1:-1])
          else:
              writer.simpletag(name, value=value)
          writer.newline()
  
imports: from fontTools.misc import sstruct
  from fontTools.misc.roundTools import otRound
  from fontTools.misc.textTools import safeEval, num2binary, binary2num
  from fontTools.ttLib.tables import DefaultTable
  import bisect
  import logging
label_desc: Use image node_id 3 for calling the table_O_S_2f_2 obj's underlying member method code with example usage: obj.toXML(writer, ttFont) without return types