如何对嵌套字典使用Schema.from_dict()？

from jsonschema import Schema, ValidationError

class MySchema(Schema):
    def __init__(self, my_dict):
        self.property1 = my_dict.get('property1')
        self.property2 = my_dict.get('property2')
        self.nested_property = NestedSchema.from_dict(my_dict.get('nested_property'))

class NestedSchema(Schema):
    def __init__(self, nested_dict):
        self.nested_property1 = nested_dict.get('nested_property1')
        self.nested_property2 = nested_dict.get('nested_property2')

my_dict = {
    'property1': 'value1',
    'property2': 'value2',
    'nested_property': {
        'nested_property1': 'nested_value1',
        'nested_property2': 'nested_value2'
    }
}

try:
    my_schema = MySchema.from_dict(my_dict)
    print("Schema created successfully!")
except ValidationError as e:
    print("Error creating schema:", e)