Flask Learning configuration file loading and use of dynamic URLs

Seven lines of code to implement a flask app

fromimport= Flask(__name__)@app.route(‘/‘)def helloworld():    return‘helloworld‘if__name__==‘__main__‘:    app.run()

app.run()Suitable for commissioning only, not for production environments, production environments should start with Gunicorn and Uwsgi

Configuration Management

• App. Config is an instance of the Flask.config.Config class that inherits from the Python built-in data structure dict, which you can add with Dict configuration
  1. app.config[' DEBUG ']= True
  2. Use the Update method

   App.config.update (Debug=  true , Secrey_key=   ' HELLOWORLD ' ,)  

• General project configurations are uniformly placed in a single settings.py file that can centrally manage configuration items

  # settings.pyclass Develop():    =Trueclass Product():    =False== Product()

  # app.pyfromimport Flaskfromimport= Flask(__name__)app.config.from_object(product)

• By loading the file name, you can learn
  • app.config.from_pyfile(‘settings.py‘,slient=True)
• By loading the environment variables, you can understand
  • app.config.from_envvar(‘settings_path‘)

Configuration of dynamic URLs

• The URL Translator Converter is defined in flask and requires the actual special field tag when used

• <name>No parameter type specified or <converter_name:name> parameter type specified

  @app.route(‘/item/<id>/‘)def detali(id):returnid

Custom URL Converters

• Inherits from Baseconverter

   From  werkzeug.routing import  baseconverterclass  Customconverter (baseconverter): def  __init__  ( Self , Url_map,regex): super  (customconverter, self ). __init__  (url_map) self . Regex =  regex  pre> 

• Use

  fromimport= Flask(__name__)app.config.from_object(develop)app.url_map.converters[‘re‘=# 添加到converter列表中@app.route(‘/hello/<re("[1-9]{2}"):cus>/‘# re("regex") 定义匹配规则def custom(cus):    return cus

Flask Learning configuration file loading and use of dynamic URLs