Flask 2.0.1 changes

Version 2.0.1

Released 2021-05-21

• Re-add the filename parameter in send_from_directory. The filename parameter has been renamed to path, the old name is deprecated. #4019

• Mark top-level names as exported so type checking understands imports in user projects. #4024

• Fix type annotation for g and inform mypy that it is a namespace object that has arbitrary attributes. #4020

• Fix some types that weren’t available in Python 3.6.0. #4040

• Improve typing for send_file, send_from_directory, and get_send_file_max_age. #4044, #4026

• Show an error when a blueprint name contains a dot. The . has special meaning, it is used to separate (nested) blueprint names and the endpoint name. #4041

• Combine URL prefixes when nesting blueprints that were created with a url_prefix value. #4037

• Roll back a change to the order that URL matching was done. The URL is again matched after the session is loaded, so the session is available in custom URL converters. #4053

• Re-add deprecated Config.from_json, which was accidentally removed early. #4078

• Improve typing for some functions using Callable in their type signatures, focusing on decorator factories. #4060

• Nested blueprints are registered with their dotted name. This allows different blueprints with the same name to be nested at different locations. #4069

• register_blueprint takes a name option to change the (pre-dotted) name the blueprint is registered with. This allows the same blueprint to be registered multiple times with unique names for url_for. Registering the same blueprint with the same name multiple times is deprecated. #1091

• Improve typing for stream_with_context. #4052