Pass parameters and returned responses of flask

The ginseng

1. Fixed parameter

from flask import Flask 

app.Flask(__name__)

# <int: integer >/<string: character string >/< Default string >
@app.route('/hello/<int:id>')
def hello(id)
	return f' The received ID by ：{
      id}'

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

2. Custom converter

from flask import Flask
from flask import BaseConverter

app = Flask(__name)

#  Custom converter 
class PhoneConverter(BaseConverter):
	# regex Fixed variable 
    regex = r'1[3-9][0-9]{9}'
    
app.url_map.converters['phone'] = PhoneConverter

@app.route('/phone/<phone:my_phone>'
def get_phone(my_phone):
    return f' The cell phone number is {
      my_phone}'

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

3. View the transfer parameters ’get’

from flask import Flask      
from flask import request
 #  View the transfer parameters 
 @app.route('/query')
 def query():
     params = request.args.to_dict() #  Convert an immutable dictionary into an ordinary dictionary 
     print(params)
     name = request.args['name']
     age = request.args.get('age')
     return f' The current name is ：{
      name},  Age is ：{
      age}'

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

4. Acquisition of forms ‘post’

from flask import Flask 
from flask import request

@app.route('/form', methods=['post'])
def form():
    name = request.form.get('name')
    age = request.form.get('age')
    return f'name:{
      name}, age:{
      age}'

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

6. Upload files

from flask import Flask
from flask import request

@app.route('/upload', methods=['post'])
def upload():
    img = request.files.get('img')
    print(img)
    #  Save to... In the current directory static in 
    img.save('./static/01.png')
    return ' Upload successful '     

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

7. The other parameters

from flask import Flask
from flask import request

@app.route('/other')
def other():
    print(request.headers)
    print(request.method)
    print(request.url)
    return ' The other parameters '

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

Return of response

1. return HTML Page data

from flask import Flask
from flask import render_template

app.Flask(__name__)

@app.route('/page')
def page():
    return render_template('hello.html')

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

2. Jump to the page when returning the response

from flask import Flask 
from flask import redirect

app.Flask(__name__)

@app.route('/jump')
def jump():
    return redirect('https://www.baidu.com')

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

3. Return dictionary

from flask import Flask
from flask import jsonify

app.Flask(__name__)

@app.route('/return_json')
def return_json():
    data = {
    
        'name': 'zhangsan',
        'age': 18,
        'action': [' eat ', ' sleep ', ' Use the toilet ']
    }
    return jsonify(data)  

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

4. Return a tuple

from flask import Flask

app.Flask(__name__)

@app.route('/return_json')
def return_json():
    return ('hello', 5400,{
    'aaa': 'bbbb'})  

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

5. Custom response object

from flask import Flask
from flask import make_response

app.Flask(__name__)

@app.route('/return_json')
def return_obj():
    resp = make_response('hello')
    resp.status = '404'
    resp.headers['aaa'] = 'bbb'
    return resp  

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