param_parameterized_class_with_typed_validated_parameters.py

1import param
2
3class Shape(param.Parameterized):
4    radius = param.Number(default=1.0, bounds=(0, 10))
5    color  = param.Selector(objects=['red', 'green', 'blue'])
6    
7    def __init__(self, **params):
8        super().__init__(**params)
9        self._area = 3.14 * self.radius**2
10
11    @param.depends('radius', watch=True)
12    def _update_area(self):
13        self._area = 3.14 * self.radius**2
14
15    @param.output(area=param.Number)
16    def area(self):
17        return self._area
18
19shape = Shape(radius=5, color='blue')
20print(f"Radius: {shape.radius}, Color: {shape.color}, Area: {shape.area()}")