15行Python 仿百度搜索引擎

Posted 2020-10-28 RongT

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开发工具：PyCharm

开发环境：python3.6 + flask + requests

开发流程:

1. 启动一个web服务

from flask import Flask
app = Flask(__name__)
if __name__ == \'__main__\':
    app.run(host=\'127.0.0.1\', port=6666)

2. 增加app.route装饰器

from flask import Flask

app = Flask(__name__)

@app.route(\'/\')
def index():
    return \'Hello World\'
if __name__ == \'__main__\':
    app.run(host=\'127.0.0.1\', port=5000)

3. 增加index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>仿百度搜索</title>
    <style type="text/css">
        .align-center{
        position:fixed;left:30%;top:30%;margin-left:width/2;margin-top:height/2;
        }
    </style>
</head>
<body>
    <form action="/s" method="get">
        <div class="align-center">
            <input type="search" name="key"> <input type="submit" value="搜索"><br>
        </div>
    </form>
</body>
</html>

index.html

4. 增加 render_template

from flask import Flask
from flask import render_template
app = Flask(__name__)

@app.route(\'/\')
def index():
    return render_template(\'index.html\')
if __name__ == \'__main__\':
    app.run(host=\'127.0.0.1\', port=5000)

5. 增加返回结果

@app.route(\'/s\')
def search():
    return \'Hello World\'

6. spider.py

import requests

def getBdMsg(keyword):
    headers = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36"}
    res = requests.get(\'https://www.baidu.com/s?wd={}\'.format(keyword), headers = headers).text
    return res

7. 获取搜索框关键字，通过爬虫程序搜索，获得百度搜索结果

from flask import Flask
from flask import render_template
from flask import request
from spider import getBdMsg
app = Flask(__name__)

@app.route(\'/\')
def index():
    return render_template(\'index.html\')

@app.route(\'/s\')
def search():
    keyword = request.args.get("key")
    text = getBdMsg(keyword)
    return text

if __name__ == \'__main__\':
    app.run(host=\'127.0.0.1\', port=5000)

8. 修改spider.py的返回结果，通过链式replace()，替换百度图标和“百度一下”

return res.replace(\'//www.baidu.com/img/baidu_jgylogo3.gif\',\'static/images/google.png\').replace(\'百度一下\', \'Google\')

附完整源码：

# -*- coding: utf-8 -*-
# @Time    : 2018/3/19 12:46
# @Author  : TanRong
# @Software: PyCharm
# @File    : search.py

from flask import Flask
from flask import render_template
from spider import getBdMsg
from flask import request

# Flask(__name__).run()
app = Flask(__name__)

#app.route装饰器
@app.route(\'/\')
def index():
    return render_template(\'index.html\')

@app.route(\'/s\')
def search():
    keyword = request.args.get(\'key\')
    text = getBdMsg(keyword)
    return text

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

search.py

# -*- coding: utf-8 -*-
# @Time    : 2018/3/21 18:07
# @Author  : TanRong
# @Software: PyCharm
# @File    : spider.py

import requests

def getBdMsg(keyword):
    # 必须加上请求头，这样才是浏览器请求，不然无返回结果
    # F12 - NetWork - Requeset Headers - UserAgent
    headers = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36"}
    res = requests.get(\'https://www.baidu.com/s?wd={}\'.format(keyword), headers = headers).text
    return res.replace(\'//www.baidu.com/img/baidu_jgylogo3.gif\',\'static/images/google.png\').replace(\'百度一下\',\'Google\').replace(\'百度\',\'Google\') #链式replace()

if __name__ == \'__main__\':
    getBdMsg(\'风景\')

spider.py

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>仿百度搜索</title>
    <style type="text/css">
        .align-center{
        position:fixed;left:30%;top:30%;margin-left:width/2;margin-top:height/2;
        }
    </style>
</head>
<body>
    <form action="/s" method="get">
        <div class="align-center">
            <input type="search" name="key"> <input type="submit" value="搜索"><br>
        </div>
    </form>
</body>
</html>

index.html

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