old_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os, sys, re
  from fontTools.ttLib import TTFont
  from fontTools.pens.boundsPen import BoundsPen, ControlBoundsPen
  
  class ConcordanceInfo(object):
      def __init__(self):
          self.glyphs = 0
          self.concordant_glyphs = 0
          self.maxdiff = 0
          self.maxdiff_gname = None
  
      def update(self, diff, gname):
          self.glyphs += 1
          if diff <= 1:
              self.concordant_glyphs += 1
          elif diff > self.maxdiff:
              self.maxdiff = round(diff, 2)
              self.maxdiff_gname = gname
  
  def calc_bounds(font, gname, penclass):
      gs = font.getGlyphSet()
      g = gs[gname]
      pen = penclass(gs)
      g.draw(pen)
      return [round(v, 2) for v in pen.bounds] if pen.bounds is not None else None
  
  def bounds_differ(bounds1, bounds2):
      for v1, v2 in zip(bounds1, bounds2):
          if abs(v1 - v2) > 1:
              return True
      return False
  
  def compare_bounds():
      font1_path = sys.argv[1]
      font2_path = sys.argv[2]
      font1 = TTFont(font1_path, fontNumber=0)
      font2 = TTFont(font2_path, fontNumber=0)
      for gname in font1.getGlyphOrder():
          bound1 = calc_bounds(font1, gname, BoundsPen)
          bound2 = calc_bounds(font2, gname, BoundsPen)
          if bound1 is None or bound2 is None:
              if bound1 is not None or bound2 is not None:
                  print "[{}] {} {}".format(gname, bound1, bound2)
          elif bounds_differ(bound1, bound2):
              print "[{}] {} {}".format(gname, bound1, bound2)
  
  def main():
      compare_bounds()
  
  if __name__ == "__main__":
      main()
  
new_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os, sys, re
  from fontTools.ttLib import TTFont
  from fontTools.pens.boundsPen import BoundsPen, ControlBoundsPen
  
  class ConcordanceInfo(object):
      def __init__(self):
          self.glyphs = 0
          self.concordant_glyphs = 0
          self.maxdiff = 0
          self.maxdiff_gname = None
  
      def update(self, diff, gname):
          self.glyphs += 1
          if diff <= 1:
              self.concordant_glyphs += 1
          elif diff > self.maxdiff:
              self.maxdiff = round(diff, 2)
              self.maxdiff_gname = gname
  
  def calc_bounds(font, gname, penclass):
      gs = font.getGlyphSet()
      g = gs[gname]
      pen = penclass(gs)
      g.draw(pen)
      return [round(v, 2) for v in pen.bounds] if pen.bounds is not None else None
  
  def bounds_differ(bounds1, bounds2):
      for v1, v2 in zip(bounds1, bounds2):
          if abs(v1 - v2) > 1:
              return True
      return False
  
  def compare_bounds():
      font1_path = sys.argv[1]
      font2_path = sys.argv[2]
      font1 = TTFont(font1_path, fontNumber=0)
      font2 = TTFont(font2_path, fontNumber=0)
      for gname in font1.getGlyphOrder():
          bounds1 = calc_bounds(font1, gname, BoundsPen)
          bounds2 = calc_bounds(font2, gname, BoundsPen)
          if bounds1 is None or bounds2 is None:
              if bounds1 is not None or bounds2 is not None:
                  print "[{}] {} {}".format(gname, bounds1, bounds2)
          elif bounds_differ(bounds1, bounds2):
              print "[{}] {} {}".format(gname, bounds1, bounds2)
  
  def main():
      compare_bounds()
  
  if __name__ == "__main__":
      main()
  
subject: change variable name