一、数据爬取

使用pyspider，在豆瓣把两部电影的影评拉下来，存储起来

pyspider脚本：

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# Created on 2018-03-10 21:44:35
# Project: douban_movie

from pyspider.libs.base_handler import *
from pyspider.database.mysql.pymysql import SQL


class Handler(BaseHandler):
    crawl_config = {
        'headers' : {'Connection':'keep-alive','Accept-Encoding':'gzip, deflate, br','Accept-Language':'zh-CN,zh;q=0.8','content-type':'application/x-www-form-urlencoded','User-Agent':'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36'}
    }

    def on_start(self):
        self.crawl('https://movie.douban.com/subject/26861685/comments?start=0&limit=20', callback=self.getCount)
            

    def getCount(self, response):
        commentCount = int(response.doc('.is-active > span').text()[3:-1])
        startNum = 0
        for i in range(int(commentCount/20)):
            self.crawl('https://movie.douban.com/subject/26861685/comments?start='+str(startNum) +'&limit=20', callback=self.detail_page)
            startNum = startNum + 20

    @config(priority=2)
    def detail_page(self, response):
        result = []
        for item in response.doc('.comment > p').items():
            result.append({
                "comment": item.text()
            })
        return result
    
    def on_result(self,result):
        if not result or len(result)==0:
            return
        sql = SQL()
        for item in result:
            sql.insert('movie_comment',**item)

需要在/usr/lib/python2.7/site-packages/pyspider/database/mysql/下放入以下文件
文件名：pymysql.py

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
from six import itervalues
import pymysql
import pymysql.cursors

class SQL():
    #数据库初始化
    def __init__(self):
        self.connection = False
        try:
            self.conn = pymysql.connect(host='localhost',
                             user='root',
                             password='123456',
                             db='data_analyse',
                             charset='utf8',
                             cursorclass=pymysql.cursors.DictCursor)
            self.cursor = self.conn.cursor()
            self.cursor.execute("set names utf8")
            self.connection = True
        except Exception as e:
            print("Cannot Connect To Mysql!/n")

    def escape(self,string):
        return '%s' % string
    #插入数据到数据库   
    def insert(self,tablename=None,**values):

        if self.connection: 
            tablename = self.escape(tablename)  
            if values:
                _keys = ",".join(self.escape(k) for k in values)
                _values = ",".join(['%s',]*len(values))
                sql_query = "insert into %s (%s) values (%s)" % (tablename,_keys,_values)
            else:
                sql_query = "replace into %s default values" % tablename
            try:
                if values:
                    self.cursor.execute(sql_query,list(itervalues(values)))
                else:       
                    self.cursor.execute(sql_query)
                self.conn.commit()
                return True
            except Exception as e:
                print('An Error Occured: ',e)
                return False