如何利用python写api接口实战指南

#!/usr/bin/python3
# encoding:utf-8
import flask,json
# 实例化api，把当前这个python文件当作一个服务，__name__代表当前这个python文件
api = flask.Flask(__name__) 
 
# 'index'是接口路径，methods不写，默认get请求     
@api.route('/index',methods=['get']) 
# get方式访问
def index():
  ren = {'msg':'成功访问首页','msg_code':200}
  #json.dumps 序列化时对中文默认使用的ascii编码.想输出中文需要指定ensure_ascii=False
  return json.dumps(ren,ensure_ascii=False)
 
#post入参访问方式一：url格式参数
@api.route('/article',methods=['post']) 
def article():
  #url格式参数?id=12589&name='lishi'
  id = flask.request.args.get('id')
   
  if id:
    if id == '12589':
      ren = {'msg':'成功访问文章','msg_code':200}
    else:
      ren = {'msg':'找不到文章','msg_code':400}
  else:
    ren = {'msg':'请输入文章id参数','msg_code':-1}
  return json.dumps(ren,ensure_ascii=False)
 
#post入参访问方式二：from-data（k-v）格式参数
@api.route('/login',methods=['post'])
def login():
  #from-data格式参数
  usrname = flask.request.values.get('usrname')
  pwd = flask.request.values.get('pwd')
   
  if usrname and pwd:
    if usrname =='test' and pwd =='123456':
      ren = {'msg':'登录成功','msg_code':200}
    else:
      ren = {'msg':'用户名或密码错误','msg_code':-1}
  else:
    ren = {'msg':'用户名或密码为空','msg_code':1001}
  return json.dumps(ren,ensure_ascii=False)
 
#post入参访问方式二：josn格式参数  
@api.route('/loginjosn',methods=['post'])
def loginjosn():
  #from-data格式参数
  usrname = flask.request.json.get('usrname')
  pwd = flask.request.json.get('pwd')
   
  if usrname and pwd:
    if usrname =='test' and pwd =='123456':
      ren = {'msg':'登录成功','msg_code':200}
    else:
      ren = {'msg':'用户名或密码错误','msg_code':-1}
  else:
    ren = {'msg':'用户名或密码为空','msg_code':1001}
  return json.dumps(ren,ensure_ascii=False)
 
if __name__ == '__main__':
  api.run(port=8888,debug=True,host='127.0.0.1') # 启动服务
  # debug=True,改了代码后，不用重启，它会自动重启
  # 'host='127.0.0.1'别IP访问地址

flask.request.form.get("key", type=str, default=None) 获取表单数据，
flask.request.args.get("key") 获取get请求参数，
flask.request.values.get("key") 获取所有参数。