docs: def _merge_ex_dicts(sexdict, oexdict):
      """Merge callable look-up tables from two objects."""
      # pylint: disable=R0101
      for okey, ovalue in oexdict.items():
          # Keys in other dictionary are callable paths or
          # callables ids depending on the full_cname argument
          # of the handler
          if okey in sexdict:
              svalue = sexdict[okey]
              # Each callable dictionary entry is itself a dictionary where the
              # key is (exception type, exception message) and the value is a
              # dictionary with keys 'function' (a list of callable paths to
              # the function), 'raised' (list of booleans indicating whether the
              # exception though each callable path was raised or not) and name
              for fkey, fvalue in ovalue.items():
                  if fkey not in svalue:
                      # The other dictionary has a callable path not present in
                      # the self dictionary, add it unmodified
                      sexdict[okey][fkey] = fvalue
                  else:
                      # The other dictionary has a callable and exception
                      # present in the self dictionary, have to check whether
                      # the callable path is the same (in which case update
                      # raise flag) or not (in which case add to 'function' and
                      # 'raise' keys
                      iobj = zip(fvalue["function"], fvalue["raised"])
                      for func, raised in iobj:
                          if func not in sexdict[okey][fkey]["function"]:
                              sexdict[okey][fkey]["function"].append(func)
                              sexdict[okey][fkey]["raised"].append(raised)
                          else:
                              idx = sexdict[okey][fkey]["function"].index(func)
                              sraised = sexdict[okey][fkey]["raised"][idx]
                              if sraised or raised:
                                  sexdict[okey][fkey]["raised"][idx] = True
          else:
              sexdict[okey] = ovalue