前面用爬蟲爬了近幾年房價均值，和用Matplotlib 畫了一個曲線圖
然而直觀的可視化信息一般都是在前端實現交互，下面我們用Python+Web實現一個小的數據展示
HTML代碼
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 <link rel="stylesheet" href="static/css/base.css"/> 7 </head> 8 <body onload="Onload()"> 9 <div class="head">重慶沙坪壩房價均值</div> 10 <div class="body_right"> 11 <label>請輸入年限（2009~2017）</label><input type="text" name="First_year"/><label>請輸入比較年(2009~2017)</label><input type="text" name="Twice_year" /><input type="button" name="Submit" value="Submit"/> 12 <img id="showimg" /> 13 14 </div> 15 </body> 16 </html> 17 <script type="text/javascript"> 18 function Onload() { 19 var x = document.getElementsByName("Submit"); 20 var First_year = document.getElementsByName("First_year")[0]; 21 var Twice_year = document.getElementsByName("Twice_year")[0]; 22 x[0].addEventListener("click", function () { 23 AJAX("get", "/find", "first=" + First_year.value + "&tiwce=" + Twice_year.value, 1) 24 }); 25 } 26 27 function AJAX(type, url, datas, state) { 28 var xhr; 29 if (window.XMLHttpRequest) {//除Ie外的瀏覽器 30 xhr = new XMLHttpRequest; 31 } else if (window.ActiveXObject) {//Ie 32 try { 33 xhr = new ActiveXObject("Msxml2.XMLHTTP");//IE4以下 34 } catch (e) { 35 xhr = ActiveXObject("Micsoft.XMLHTTP"); 36 } 37 } 38 if (type == "get" || type == "GET") { 39 url = url + "?" + datas; 40 } 41 xhr.open(type, url, true); 42 if (type == "post" || type == "POST") { 43 xhr.setRequestHeader("Content-Type", "Application/x-www-form-urlencoded"); 44 xhr.send(datas); 45 } else if (type == "get" || type == "GET") { 46 xhr.send(null); 47 } else { 48 return false; 49 } 50 xhr.onreadystatechange = function () { 51 //switch (xhr.readyState) { 52 // case 1: 53 // alert("請求已經提出。。。"); 54 // break; 55 // case 2: 56 // alert("請求已發送。。。"); 57 // break; 58 // case 3: 59 // alert("請求處理中"); 60 // break; 61 // case 4: 62 // alert("請求成功"); 63 // alert(xhr.responseText); 64 // break; 65 // } 66 if (xhr.readyState == 4 && xhr.status == 200) { 67 //alert(xhr.responseText); 68 if (state == 1) { 69 var jsons = JSON.parse(xhr.responseText); 70 var show = document.getElementById("showimg"); 71 //alert(jsons.url) 72 show.src = jsons.url; 73 } 74 } 75 } 76 } 77 </script>
我們通過兩個輸入框將想要比較的年份信息通過AJAX異步傳到后台Python,通過后台返回的圖片路徑，讓img標簽起到展示數據的作用
后台Python
1 mport flask 2 import pymongo 3 import matplotlib.pyplot as mp 4 import re 5 6 client = pymongo.MongoClient('mongodb://localhost:27017') 7 app = flask.Flask(__name__) 8 9 @app.route('/') 10 def index(): 11 return flask.render_template('base.html') 12 @app.route('/find') 13 def find(): 14 first = flask.request.args.get('first') 15 twice = flask.request.args.get('tiwce') 16 firstTime = list(client['HousePrice']['CQ'].find({'dateTime':re.compile(first)})) 17 twiceTime = list(client['HousePrice']['CQ'].find({'dateTime': re.compile(twice)})) 18 MapOnex = [] 19 MapOney = [] 20 MapTwox = [] 21 MapTwoy = [] 22 for i in firstTime: 23 MapOnex.append(i['dateTime'][5:8]) 24 MapOney.append(int(i['housePrice'][0:4])) 25 for i in twiceTime: 26 MapTwox.append(i['dateTime'][5:8]) 27 MapTwoy.append(int(i['housePrice'][0:4])) 28 mp.title('CQSPBHousePrice') 29 mp.xlabel('Month') 30 mp.ylabel('Price') 31 mp.plot(MapOnex,MapOney, label = 'year:'+first) 32 mp.plot(MapTwox, MapTwoy, label='year:' + twice) 33 mp.legend(bbox_to_anchor=[0.5,1]) 34 mp.grid() 35 mp.savefig('E:\Practice\CQHousePrice\static\IMG/'+first+'-'+ twice +'.png') 36 mp.close() 37 return flask.json.dumps({'url': '/static/IMG/'+first+'-'+twice +'.png'}) 38 if __name__ == '__main__': 39 app.run('localhost', 5000)
這里通過前端傳來的兩個年份信息，我們經行一個模糊查詢，並將數據信息畫成圖，存入文件，通過JSON數組
將文件路徑返回給前端JS，實現簡單的Web與Python的交互，將數據可視化
效果圖：
若您有改進建議或者問題，請在評論區指出
謝謝！