docstr: Return the kerning pair distance (possibly 0) for chars *c1* and *c2*.
code: def get_kern_dist(self, c1, c2):
      """
      Return the kerning pair distance (possibly 0) for chars *c1* and *c2*.
      """
      name1, name2 = self.get_name_char(c1), self.get_name_char(c2)
      return self.get_kern_dist_from_name(name1, name2)
  
imports: from collections import namedtuple
  import logging
  import re
  from ._mathtext_data import uni2type1
label_desc: Use image node_id 10 for calling the AFM obj's underlying member method code with example usage: obj.get_kern_dist(c1, c2) and returns: self