param_parameterized_class_with_validated_typed_attributes.py

1import param
2
3class Shape(param.Parameterized):
4    radius = param.Number(default=1.0, bounds=(0, 10))
5    color  = param.Selector(objects=['red', 'yellow', 'green'])
6
7    def area(self):
8        import math
9        return math.pi * self.radius**2
10
11shape = Shape(radius=5, color='red')
12
13# Parameters provide validation
14try:
15    shape.radius = 20  # This will raise an error (out of bounds)
16except ValueError as e:
17    print(e)
18
19# Parameters provide a clean API for accessing and setting values
20print(f"Radius: {shape.radius}")
21print(f"Color: {shape.color}")
22print(f"Area: {shape.area():.2f}")