code: def iconcat(a, b):
      "Same as a += b, for a and b sequences."
      if not hasattr(a, '__getitem__'):
          msg = "'%s' object can't be concatenated" % type(a).__name__
          raise TypeError(msg)
      a += b
      return f iconcat(a, b):
      "Same as a += b, for a and b sequences."
      if not hasattr(a, '__getitem__'):
          msg = "'%s' object can't be concatenated" % type(a).__name__
          raise TypeError(msg)
      a += b
      return a
docs: Same as a += b, for a and b sequences.