def by_schema_extension_id(self,schema_extension_id: str) -> SchemaExtensionItemRequestBuilder:
        """
        Provides operations to manage the collection of schemaExtension entities.
        param schema_extension_id: The unique identifier of schemaExtension
        Returns: SchemaExtensionItemRequestBuilder
        """
        if schema_extension_id is None:
            raise TypeError("schema_extension_id cannot be null.")
        from .item.schema_extension_item_request_builder import SchemaExtensionItemRequestBuilder

        url_tpl_params = get_path_parameters(self.path_parameters)
        url_tpl_params["schemaExtension%2Did"] = schema_extension_id
        return SchemaExtensionItemRequestBuilder(self.request_adapter, url_tpl_params)

        Provides operations to manage the collection of schemaExtension entities.
        param schema_extension_id: The unique identifier of schemaExtension
        Returns: SchemaExtensionItemRequestBuilder
        
msgraph/generated/schema_extensions/schema_extensions_request_builder.py