python flask 源码学习

class Flask:

#: Whether debug mode is enabled. When using ``flask run`` to start

#: the development server, an interactive debugger will be shown for

#: unhandled exceptions, and the server will be reloaded when code

#: changes. This maps to the :data:`DEBUG` config key. This is

#: enabled when :attr:`env` is ``'development'`` and is overridden

#: by the ``FLASK_DEBUG`` environment variable. It may not behave as

#: expected if set in code.

wsgi启动（werkzeug.serving lib）