C:\Users\dell\PycharmProjects\untitled4>application.py
  File "C:\Users\dell\PycharmProjects\untitled4\application.py", line 5
    class Application( Flask )
                             ^
SyntaxError: invalid syntax

C:\Users\dell\PycharmProjects\untitled4>application.py
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:814: UserWarning: Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "s
qlite:///:memory:".
  'Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. '
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in
the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '

C:\Users\dell\PycharmProjects\untitled4>python manager.py
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:814: UserWarning: Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "s
qlite:///:memory:".
  'Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. '
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in
the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
* Serving Flask app "application" (lazy loading)
* Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
* Debug mode: off
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
这个已经出来了
但是直接点击出现网页错误，网页提示如下
Not Found
The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.
然后我把代码按照视频改了0.0.0.0
可是网页打不开了
from application import app

def main():
    app.run( host="0.0.0.0",debug= True )

if __name__ == '__main__':
    try:
        import sys
        sys.exit( main() )
    except Exception as e:
        import traceback
        traceback.print_exc()

C:\Users\dell\PycharmProjects\untitled4>python manager.py
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:814: UserWarning: Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI
to "sqlite:///:memory:".
  'Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. '
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by defa
ult in the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
* Serving Flask app "application" (lazy loading)
* Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
* Debug mode: on
* Restarting with stat
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:814: UserWarning: Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI
to "sqlite:///:memory:".
  'Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. '
C:\Program Files\Python36\lib\site-packages\flask_sqlalchemy\__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by defa
ult in the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
* Debugger is active!
* Debugger PIN: 109-909-303
* Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)