python爬虫学习：网页采集器、豆瓣电影爬取、百度翻译

　　一、百度翻译

import requests
import json

if __name__ == '__main__':

    word = input('enter a word:')
    url = 'https://fanyi.baidu.com/sug'
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0'
    }
    data = {
        'kw':word
    }
    resp = requests.post(url=url,data=data,headers=headers)
    resp.encoding = 'utf-8'
    dic_obj = resp.json()
    #print(dic_obj)
    # 存储的文件名
    filename = word+'.html'
    fp = open('D:StudyPythonscrapy\'+filename,'w',encoding='utf-8')
    #print('D:StudyPythonscrapy\'+filename)
    json.dump(dic_obj,fp=fp,ensure_ascii=False)
    print('爬取成功')

　　二、豆瓣电影排行榜喜剧。排行前多少名自己设置

import requests
import json

if __name__ == '__main__':
    first = input('从第几个开始：')
    count = input('爬取多少个：')
    url = 'https://movie.douban.com/j/chart/top_list'
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0'
    }
    param = {
        'type':'24',
        'interval_id':'100:90',
        'action':'',
        'start':first,
        'limit':count,
    }
    resp = requests.get(url=url,params=param,headers=headers)
    resp.encoding = 'utf-8'
    list_data = resp.json()
    # print(list_data)
    fp = open('D:StudyPythonscrapydouban.html','w',encoding='utf-8')
    json.dump(list_data,fp=fp,ensure_ascii=False)
    print('爬取成功')

　　三、网页采集器：（相当于一个浏览器的搜索而已）

import requests


# User-Agent:(请求载体的身份标识)(两种：浏览器或者爬虫)
# UAi检测，门户网站的服务器会检测对应的请求的载体身份标识，如果载体身份标识为某一款浏览器则为正常（是用户发起的），
# User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0  （此为正常）
# 如果载体身份标识不是浏览器则不正常，则为爬虫，服务器可能拒绝此次请求


# UA伪装： 让爬虫对应的请求载体身份标识伪装成一款浏览器
if __name__ == "__main__":

    kw = input("输入要查询的关键词：")
    # UA伪装，对应的user—agent封装到一个字典中
    headers={
        'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0'
    }

    url = 'https://www.baidu.com/s'

    # 封装请求参数
    param = {
        'wd': kw
    }
    # 都指定的url发起的请求是带参数的
    resp = requests.get(url=url, params=param,headers=headers)
    # 防止中文乱码
    resp.encoding = 'utf-8'
    page_text = resp.text
    print(page_text)
    # 存储的文件名
    filename = kw+'.html'

    with open('D:StudyPythonscrapy\'+filename,'w',encoding='utf-8') as fp:
        fp.write(page_text)
        print(filename,'保存成功')