ipython-autocomplete2.py

# dynamically objects to completion

class Shape3():
    area = 1
    perimeter = 1
    location = 1
    shape_dict = {}

    def __getitem__(self, key):
        if hasattr(self, key):
            return getattr(self, key)
        
        return self.shape_dict[key]
    
    def _ipython_key_completions_(self):

        return ["area", "perimeter", "location"] + list(self.shape_dict)
    
    def add(self, key):
        self.shape_dict[key] = True
        
        
s = Shape3()
s.add("new_key")
  
# s["new<TAB>
s["new_key"]