[python flask notes 5] blueprint is easy to use

The blueprint ：
flask Built in modules , Containers , It stores a set of operations to be performed on the program in the future , Can't run independently . You can have your own static files and templates ;
Be similar to django Subapplications in ;
Blueprint multi document use ： It is easy to have the problem of circular import
In addition to the most basic three steps , You must use the view file of the blueprint object , Import into the file that creates the blueprint object

The simplest case of blueprint - The three step

from flask import Flask,Blueprint
#  Blueprint use steps 
#1  Create blueprint object 
#2  Define blueprint routes 
#3  Register blueprint objects 
app = Flask(__name__)

#1  Create blueprint object 
bp = Blueprint('bp',__name__)
#2  Define blueprint routes 
@bp.route("/users")
def get_user():
    return 'users ..'

@app.route("/")
def index():
    return  "hi"
#3  Register blueprint objects 
app.register_blueprint(bp)
if __name__ == '__main__':
    print(app.url_map)
    app.run(debug=True)

Attention to multi document blueprints import Guide Package deadlock

Directory structure ：
You can't import each other's packages at the same time , It's like cooking with two people , No one caught it …… Application error importErro……
Multiple files in ini Of py Document creation blueprint . In class py The document says route route （ Define blueprint routes ）. Register the blueprint when calling . It can be used after startup

Use multiple files , You must use the view file of the blueprint object , Import into the file that creates the blueprint object

init.py

from flask import  Blueprint

# Create a blueprint 
news_bp = Blueprint('news_bp',__name__)

# You must use the view file of the blueprint object , Import into the file that creates the blueprint object 
from . import views

views.py

from . import  news_bp


@news_bp.route("/news")
def get_news():
    return "news demo .."

@news_bp.route("/user")
def get_user():
    return "user 666"

bluePrint.py

from flask import  Flask,Blueprint


app = Flask(__name__)
from news import news_bp

# Register blueprint objects 
app.register_blueprint(news_bp)

@app.route("/")
def index():
    return 'hi'

if __name__ == '__main__':
    print(app.url_map)
    app.run(debug=True)

design sketch ：