code: def replaceall(table, a, b, **kwargs):
      
  
      return convertall(table, {a: b}, **kwargs)
docs: Convenience function to replace all instances of `a` with `b` under all
      fields. See also :func:`convertall`.
  
      The ``where`` keyword argument can be given with a callable or expression
      which is evaluated on each row and which should return True if the
      conversion should be applied on that row, else False.