code: def __add__(self, other):
      if isinstance(other, _Base):
          return Add(self, other)
      else:
          return Add(self, Fixed(other))
  
imports: from numbers import Real
  from matplotlib import _api
  from matplotlib.axes import Axes
label_desc: Use image node_id 2 for calling the _Base obj's underlying member method code with example usage: obj.__add__(other) and returns: Add, Add