code: def getkern(self, format):
      for subtable in self.kernTables:
          if subtable.format == format:
              return subtable
      return None
  
imports: from fontTools.ttLib import getSearchRange
  from fontTools.misc.textTools import safeEval, readHex
  from fontTools.misc.fixedTools import fixedToFloat, floatToFixed
  from .None import DefaultTable
  import struct
  import sys
  import array
  import logging
label_desc: Use image node_id 1 for calling the table__k_e_r_n obj's underlying member method code with example usage: obj.getkern(format) and returns: None, subtable