Use of flask

1. install

1. install Flask

pip install Flask==1.1.4

2. Install some of his configurations , Create a req_new.txt file , Save saved content to req_new.txt In the document

Flask-Caching==1.10.1
Flask-Cors==3.0.10
Flask-Migrate==2.7.0
Flask-RESTful==0.3.9
Flask-Script==2.0.6
Flask-SQLAlchemy==2.5.1
MarkupSafe==2.0.1
PyJWT==2.3.0
PyMySQL==1.0.2
qiniu==7.6.0
redis==4.2.2

3. Click the command on the terminal data

pip install -r req_new.txt

It is best to configure in a virtual environment , In case of conflict with other libraries

2. Flask Use

1. Create a app.py file , Write code in it

from flask import Flask

app = Flask(__name__)
#  Static methods “ route ”
@app.route('/hello')
def hello():
	return 'hello word'

#  Right click to run , Click the link to enter the route 
if __name__ == '__main__':
	app.run()

2. There are three ways to automatically refresh and save ,
   The first method , Create a settings Create a... In the folder config.py Write code in the file

class DefaultConfig:
    #  Attribute name   It has to be all in capitals 
    NAME = 'zhangsan'
    DEBUG = True

stay app.py Use... In the document

from flask import Flask
from settings.config import DefaultConfig

app = Flask(__name__)
 #  Load from object 
app.config.from_object(DefaultConfig)
print(app.config)

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

if __name__ == '__main__':
	app.run()

The second method , Create one directly under the root directory setting.py File write code

AGE = 18

stay app.py Use... In the document

from flask import Flask

app = Flask(__name__)
#  Load from file 
app.config.from_pyfile('setting.py')

print(app.config)

@app.route('/hello')
def hello():
	return 'hello word'

if __name__ == '__main__':
	app.run()

The third method , Compared with the above two methods, it should be safe , It's used to put some inscriptions , Create a... On the desktop pass.py File write code

PASS = 123456

You need to configure environment variables when using


Click OK after setting

stay app.py Use... In the document

from flask import Flask

app = Flask(__name__)

app.config.from_envvar('password')

print(app.config)

@app.route('/hello')
def hello():
	return 'hello word'

if __name__ == '__main__':
	app.run()

3. Interface

#  Interface 
class Animal():
    def do_say(self):
        pass


class Cat(Animal):
    def do_say(self):
        print('miao miao')


class Dog(Animal):
    def do_say(self):
        print('wang wang')


class Forset():
    def sav(self, animal_type):
        eval(animal_type)().do_say()


if __name__ == '__main__':
    a = input(' Please enter the animal type Cat/Dog：')
    print(' What was received was ：', a)

    Forset().sav(a)

4. encapsulation Flask Method

1. Create a create_app.py File write code

from flask import Flask

def create_app():
	flask_app = Flask(__name__)
	return fiask_app
create_app()

2. There are also three ways to use
   The first one is

from create_app import create_app
from flask import url_for

app = create_app()
print(app)

@app.route('/hello', methods=["get", "post"], endpoint="aaa")
def hello():
    return 'hello'
    
if __name__ == '__main__':
    app.run()

The second kind

from create_app import create_app
from flask import url_for

app = create_app()
print(app)

@app.route('/hello', methods=["get", "post"], endpoint="aaa")
def hello():
    return 'hello'


@app.route('/path')
def get_path():
    u = url_for('aaa')
    print(u)
    return u


if __name__ == '__main__':
    app.run()

The third method

from create_app import create_app
from flask import url_for

app = create_app()
print(app)

#  No decorators 
def ccc():
    return 'ccc'

app.add_url_rule('/ccc', 'ccc', ccc)

When it runs, it needs to change the environment variables


function

success