docs: def compare_schemas(self, db_x, db_y, show=True):
          """
          Compare the structures of two databases.
  
          Analysis's and compares the column definitions of each table
          in both databases's.  Identifies differences in column names,
          data types and keys.
          """
          # TODO: Improve method
          self._printer("\tComparing database schema's {0} and {1}".format(db_x, db_y))
  
          # Run compare_dbs_getter to get row counts
          x = self._schema_getter(db_x)
          y = self._schema_getter(db_y)
          x_count = len(x)
          y_count = len(y)
  
          # Check that database does not have zero tables
          if x_count == 0:
              self._printer('\tThe database {0} has no tables'.format(db_x))
              self._printer('\tDatabase differencing was not run')
              return None
          elif y_count == 0:
              self._printer('\tThe database {0} has no tables'.format(db_y))
              self._printer('\tDatabase differencing was not run')
              return None
  
          # Print comparisons
          if show:
              uniques_x = diff(x, y, x_only=True)
              if len(uniques_x) > 0:
                  self._printer('\nUnique keys from {0} ({1} of {2}):'.format(db_x, len(uniques_x), x_count))
                  self._printer('------------------------------')
                  # print(uniques)
                  for k, v in sorted(uniques_x):
                      self._printer('{0:25} {1}'.format(k, v))
                  self._printer('\n')
  
              uniques_y = diff(x, y, y_only=True)
              if len(uniques_y) > 0:
                  self._printer('Unique keys from {0} ({1} of {2}):'.format(db_y, len(uniques_y), y_count))
                  self._printer('------------------------------')
                  for k, v in sorted(uniques_y):
                      self._printer('{0:25} {1}'.format(k, v))
                  self._printer('\n')
  
              if len(uniques_y) == 0 and len(uniques_y) == 0:
                  self._printer("Databases's {0} and {1} are identical:".format(db_x, db_y))
                  self._printer('------------------------------')
  
          return diff(x, y)