1.字符串操作

from flask import Flask,redirect,render_template,jsonify,send_file,request,Markup,session
import json
from datetime import timedelta
app = Flask(__name__)


#字符串操作:
@app.route("/")
def index():
    #return "大姐大宿建德江撒"
    # jsonify 和 json 的区别
    #return jsonify({'name':123})     #响应头 Content-Type: application/json
    return json.dumps({'name': 123})  #响应头 Content-Type: text/html; charset=utf-8